Defined Benefit Pension Plan Schedule of Defined Benefit Plans Disclosures [Table] Schedule of Defined Benefit Plans Disclosures [Table] Defined Benefit Plans and Other Postretirement Benefit Plans [Axis] Defined Benefit Plans and Other Postretirement Benefit Plans [Axis] Defined Benefit Plan and Other Postretirement Benefit Plan [Domain] Defined Benefit Plan and Other Postretirement Benefit Plan [Domain] Defined benefit pension plan Pension Plan [Member] Defined benefit pension plan Defined Benefit Plan Disclosure [Line Items] Net periodic benefit cost recognized Defined Benefit Plan, Net Periodic Benefit Cost [Abstract] Interest cost Defined Benefit Plan, Interest Cost Expected return on plan assets Defined Benefit Plan, Expected Return on Plan Assets Total net periodic benefit Defined Benefit Plan, Net Periodic Benefit Cost Debt Disclosure [Abstract] Debt Debt Disclosure [Text Block] Income Statement [Abstract] Revenue Sales Revenue, Goods, Net Fee revenue Sales Revenue, Services, Net Total revenue Revenue, Net Costs and expenses: Costs and Expenses [Abstract] Cost of goods sold (excluding amortization) Cost of Goods Sold Client distributions Profit Sharing Distributions This element represents the disbursement made as per the profit sharing arrangements after deducting the allowable operating expenses. Technology and operations Technology and Operation Includes technology expenses which consist primarily of personnel costs related to programming staff who develop and deploy new marketplaces and continuously enhance existing marketplaces. These personnel also develop and upgrade the software systems that support operations, such as sales processing. It also includes operations expenses which consist primarily of operating costs, including buyer relations, shipping logistics and distribution center operating costs. Sales and marketing Sales and Marketing Sales and marketing expenses include the cost of sales and marketing personnel as well as the cost of marketing and promotional activities. These activities include online marketing campaigns such as paid search advertising. General and administrative General and Administrative Expense Depreciation and amortization Depreciation, Depletion and Amortization, Nonproduction Acquisition costs Acquisition Costs and Goodwill Impairment This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, and earn-out payments. Total costs and expenses Costs and Expenses Other operating income Other Operating Income Loss from operations Operating Income (Loss) Interest expense (income) and other expense, net Other Nonoperating Income (Expense), Net The net amount of other income and expense amounts, the components of which are not separately disclosed on the income statement, resulting from ancillary business-related activities (that is, excluding major activities considered part of the normal operations of the business) also known as other nonoperating income (expense) recognized for the period. Such amounts may include: (a) dividends, (b) interest on securities, (c) net gains or losses on securities, (d) unusual costs, (e) gains or losses on foreign exchange transactions, (f) miscellaneous other income and expense items, and interest on notes payable. Loss before provision (benefit) for income taxes Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest Provision (benefit) for income taxes Income Tax Expense (Benefit) Net loss Net Income (Loss) Available to Common Stockholders, Basic Basic and diluted loss per common share (USD per share) Earnings Per Share, Basic and Diluted Basic and diluted weighted average shares outstanding (in shares) Weighted Average Number of Shares Outstanding, Basic and Diluted Accounting Policies [Abstract] Schedule of Business Acquisitions, by Acquisition [Table] Schedule of Business Acquisitions, by Acquisition [Table] Schedule of Receivables with Imputed Interest, Name of Receivable with Imputed Interest [Axis] Schedule of Receivables with Imputed Interest, Name of Receivable with Imputed Interest [Axis] Name of Receivable with Imputed Interest [Domain] Name of Receivable with Imputed Interest [Domain] Tanager Acquisitions Promissory Note Tanager Acquisitions Promissory Note [Member] Tanager Acquisitions Promissory Note [Member] Balance Sheet Location [Axis] Balance Sheet Location [Axis] Balance Sheet Location [Domain] Balance Sheet Location [Domain] Other Assets Other Assets [Member] Prepaid Expenses and Other Current Assets Prepaid Expenses and Other Current Assets [Member] Business Combination [Line Items] Business Acquisition [Line Items] Inventory reserve Inventory Valuation Reserves Receivable with imputed interest, term Receivable with Imputed Interest, Term Receivable with Imputed Interest, Term Receivable with imputed interest, face amount Receivable with Imputed Interest, Face Amount Proceeds from collection of notes receivable Proceeds from Collection of Notes Receivable Receivable with imputed interest, net amount Receivable with Imputed Interest, Net Amount Statement of Stockholders' Equity [Abstract] Statement [Table] Statement [Table] Equity Components [Axis] Equity Components [Axis] Equity Component [Domain] Equity Component [Domain] Common Stock Common Stock [Member] Additional Paid-in Capital Additional Paid-in Capital [Member] Accumulated Other Comprehensive Loss AOCI Attributable to Parent [Member] Retained Earnings Retained Earnings [Member] Statement Statement [Line Items] Increase (Decrease) in Stockholders' Equity Increase (Decrease) in Stockholders' Equity [Roll Forward] Balance Stockholders' Equity Attributable to Parent Balance (in shares) Shares, Issued Vesting of restricted stock (in shares) Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures Vesting of restricted stock and exercise of stock options Stock Issued During Period, Value, Share-based Compensation, Net of Forfeitures Compensation expense and incremental tax loss from grants of common stock options and restricted stock Adjustment to additional paid in capital sharebased compensation requisite service period recognition value and income tax effect from share based compensation net Represents the aggregate of (i) the amount of recognized equity-based compensation during the period, that is, the amount recognized as expense in the income statement (or as asset if compensation is capitalized). Alternate captions include the words "stock-based compensation"; and (ii) adjustment to additional paid in capital related to the net effect of excess tax benefits and tax deficiencies associated with an equity-based compensation plan other than an employee stock ownership plan (ESOP). Net loss Foreign currency translation Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Portion Attributable to Parent Balance Balance (in shares) Income Tax Disclosure [Abstract] Expected effective tax rate (as a percent) Estimated Effective Income Tax Rate Continuing Operations Represents the estimated effective tax rate for the current fiscal year. Decrease in unrecognized tax benefits Unrecognized Tax Benefits, Period Increase (Decrease) Finite-Lived Intangible Assets, Net [Abstract] Future expected amortization of intangible assets Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract] 2017 (remaining three months) Finite-Lived Intangible Assets, Amortization Expense, Remainder of Fiscal Year 2018 Finite-Lived Intangible Assets, Amortization Expense, Year Two 2019 Finite-Lived Intangible Assets, Amortization Expense, Year Three 2020 Finite-Lived Intangible Assets, Amortization Expense, Year Four 2021 and thereafter Finite Lived Intangible Assets Amortization Expense Year Five and Thereafter Amount of amortization expense expected to be recognized during the fifth fiscal year following the latest fiscal year and thereafter for assets, excluding financial assets and goodwill, lacking physical substance with a finite life. Total Intangible Assets, Net (Excluding Goodwill) Subsequent Events [Abstract] Subsequent Event [Table] Subsequent Event [Table] Range [Axis] Range [Axis] Range [Domain] Range [Domain] Minimum Minimum [Member] Maximum Maximum [Member] Subsequent Event Type [Axis] Subsequent Event Type [Axis] Subsequent Event Type [Domain] Subsequent Event Type [Domain] Subsequent Event Subsequent Event [Member] Subsequent Event [Line Items] Subsequent Event [Line Items] Estimated restructuring expenses Restructuring and Related Cost, Expected Cost Defined Benefit Pension Plan Defined Benefit Pension Plan Text Block Disclosure [Text Block] The entire disclosure for an entity's defined benefit pension. Statement of Financial Position [Abstract] Accounts receivable, allowance for doubtful accounts (in dollars) Allowance for Doubtful Accounts Receivable, Current Prepaid expenses and other current assets, fair value (in dollars) Prepaid Expenses and Other Assets, Fair Value Disclosure Prepaid Expenses and Other Assets, Fair Value Disclosure Common stock, par value (in dollars per share) Common Stock, Par or Stated Value Per Share Common stock, shares authorized Common Stock, Shares Authorized Common stock, shares issued Common Stock, Shares, Issued Common stock, shares outstanding Common Stock, Shares, Outstanding Goodwill. Goodwill. Goodwill Goodwill Disclosure [Text Block] Intangible Assets Intangible Assets Disclosure [Text Block] Commitments and Contingencies Disclosure [Abstract] Loss Contingencies [Table] Loss Contingencies [Table] Litigation Case [Axis] Litigation Case [Axis] Litigation Case [Domain] Litigation Case [Domain] Billard and Slingerland Putative Complaints Billard and Slingerland Putative Complaints [Member] Billard and Slingerland Putative Complaints [Member] Loss Contingencies [Line Items] Loss Contingencies [Line Items] Number of plaintiffs Loss Contingency, Number of Plaintiffs Amortization of intangible assets Amortization of Intangible Assets Subsequent Events Subsequent Events [Text Block] Statement of Comprehensive Income [Abstract] Net loss Other comprehensive (loss) income: Other Comprehensive Income (Loss), Net of Tax [Abstract] Other comprehensive loss, net of taxes Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent Comprehensive loss Comprehensive Income (Loss), Net of Tax, Attributable to Parent Guarantees [Abstract] Guarantee Obligation Value, maximum Guarantor Obligations, Current Carrying Value Fair Value Disclosures [Abstract] Changes in financial assets fair value Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block] Stockholders' Equity Note [Abstract] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Award Type [Axis] Award Type [Axis] Equity Award [Domain] Equity Award [Domain] Cash-settled stock appreciation rights Stock Appreciation Rights (SARs) [Member] Options or stock appreciation rights Stock Options Or Stock Appreciation Rights [Member] Represents the stock options or stock appreciation rights. Other than options or stock appreciation rights Other Than Stock Options Or Stock Appreciation Rights [Member] Represents equity based awards other than stock options or stock appreciation rights. Employee and director options Employee And Non Employees Stock Option [Member] An arrangement whereby an employee or non-employee is entitled to receive in the future, subject to vesting and other restrictions, a number of shares in the entity at a specified price, as defined in the agreement. Although there are variations, normally, after vesting, when an option is exercised, the holder pays the strike value in cash to the issuing employer-entity and receives equity shares. The equity shares can be sold into the market for cash at the current market price without restriction. Options may be used to attract, retain and incentivize individuals, in addition to their regular compensation and benefits. Restricted shares Restricted Stock [Member] Stockholders' Equity Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Amount yet to be expended under the program Stock Repurchase Program, Remaining Authorized Repurchase Amount Shares available for issuance Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized Increase in shares available for issuance Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized Reserve shares counted per share granted from fungible share pool (in shares) Number Of Shares Counted For Grants Of Full Value Awards From Reserve Represents information pertaining to number of shares counted for grants of full-value awards from reserve which is established as fungible share pool. Options canceled (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period Forfeited (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period Remaining shares reserved for issuance Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant Granted (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period Granted (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value Number of shares awarded per person per year Share Based Compensation Arrangement by Share Based Payment Award Number of Shares Awarded Per Person Per Year Represents the number of shares that can be awarded to any person under the stock based compensation plan per year. Shares and options vesting period Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period Intrinsic value of outstanding shares Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value Weighted average remaining contractual life of outstanding options Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term Intrinsic value of exercisable options Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value Weighted average remaining contractual life of exercisable options Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term Stock price (in dollars per share) Share Price Expected volatility, minimum (as a percent) Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate, Minimum Expected volatility, maximum (as a percent) Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate, Maximum Dividend yield (as a percent) Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate Risk free interest rate, minimum (as a percent) Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate, Minimum Risk free interest rate, maximum (as a percent) Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate, Maximum Expected forfeiture rate (as a percent) Share Based Compensation Arrangement by Share Based Payment Award Fair Value Assumptions Forfeiture Rate Represents the forfeiture rate that is used in valuing an option. Intrinsic value of unvested restricted shares Share Based Compensation Arrangement by Share Based Payment Award Equity Instruments Other than Options Nonvested Total Intrinsic Value Represents the aggregate intrinsic value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units, as calculated by applying the disclosed pricing methodology. Weighted average remaining contractual life of unvested restricted shares Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Outstanding, Weighted Average Remaining Contractual Terms Stock option activity Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] Options outstanding at the beginning of the period (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number Options granted (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross Options exercised (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period Options cancelled (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period Options outstanding at the end of the period (in shares) Options exercisable at the end of the period (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number Weighted-Average Exercise Price Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract] Options outstanding at the beginning of the period (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price Options granted (in dollars per share) Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price Options exercised (in dollars per share) Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price Options cancelled (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period, Weighted Average Exercise Price Options outstanding at the end of the period (in dollars per share) Options exercisable at the end of the period (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price Stockholders' Equity Shareholders' Equity and Share-based Payments [Text Block] Organization, Consolidation and Presentation of Financial Statements [Abstract] Minimum number of product categories offered (in categories) Number of Product Categories Offered, Minimum Represents the minimum number of product categories offered by the entity. Number of clients Number of Clients Represents the number of clients. Reportable segments (in segments) Number of Reportable Segments Assets Assets [Abstract] Current assets: Assets, Current [Abstract] Cash and cash equivalents Cash and Cash Equivalents, at Carrying Value Accounts receivable, net of allowance for doubtful accounts of $802 and $718 at December 31, 2016 and September 30, 2016, respectively Accounts Receivable, Net, Current Inventory Inventory, Net Tax refund receivable Income Taxes Receivable, Current Prepaid and deferred taxes Prepaid Taxes and Deferred Tax Assets (Liabilities) Net Current The aggregate of the (i) carrying amount as of the balance sheet date of payments made in advance for income and other taxes, which will be charged against earnings within one year or the normal operating cycle, if longer; and (ii) amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards, net of deferred tax liability attributable to taxable temporary differences expected to be realized or consumed within one year or operating cycle, if longer. Prepaid expenses and other current assets ($2.6 million and $2.2 million measured at fair value as of December 31, 2016 and September 30, 2016, respectively) Prepaid Expense and Other Assets, Current Total current assets Assets, Current Property and equipment, net Property, Plant and Equipment, Net Intangible assets, net Goodwill Goodwill Deferred long-term tax assets Deferred Tax Assets, Gross, Noncurrent Other assets Other Assets, Noncurrent Total assets Assets Liabilities and stockholders’ equity Liabilities and Equity [Abstract] Current liabilities: Liabilities, Current [Abstract] Accounts payable Accounts Payable, Current Accrued expenses and other current liabilities Accrued Expenses and Other Current Liabilities Carrying value as of the balance sheet date of obligations incurred and payable, pertaining to costs that are statutory in nature, are incurred on contractual obligations, or accumulate over time and for which invoices have not yet been received or will not be rendered. Examples include taxes, interest, rent, utilities, PTO and accrued bonuses and commissions. It also includes aggregate carrying amount, as of the balance sheet date, of current obligations not separately disclosed in the balance sheet due to materiality considerations. Current liabilities are expected to be paid within one year (or the normal operating cycle, if longer). Distributions payable Profit Sharing Distributions Payable This element represents the current portion of the profit sharing distributions payable. Customer payables Customer Payables Cash held on behalf of seller for consignment sales. Total current liabilities Liabilities, Current Deferred taxes and other long-term liabilities Deferred Tax and Other Liabilities, Noncurrent Total liabilities Liabilities Stockholders’ equity: Stockholders' Equity Attributable to Parent [Abstract] Commitments and contingencies (Note 12) Commitments and Contingencies Common stock, $0.001 par value; 120,000,000 shares authorized; 31,291,341 shares issued and outstanding at December 31, 2016; 30,742,662 shares issued and outstanding at September 30, 2016 Common Stock, Value, Issued Additional paid-in capital Additional Paid in Capital, Common Stock Accumulated other comprehensive loss Accumulated Other Comprehensive Income (Loss), Net of Tax Retained earnings (accumulated deficit) Retained Earnings (Accumulated Deficit) Total stockholders’ equity Total liabilities and stockholders’ equity Liabilities and Equity Schedule of Long-term Debt Instruments [Table] Schedule of Long-term Debt Instruments [Table] Long-term Debt, Type [Axis] Long-term Debt, Type [Axis] Long-term Debt, Type [Domain] Long-term Debt, Type [Domain] Senior Credit Facility Amended Senior Credit Facility Expiring May312018 [Member] Represents the details pertaining to senior secured credit facility expiring on May 31, 2018. Variable Rate [Axis] Variable Rate [Axis] Variable Rate [Domain] Variable Rate [Domain] LIBOR London Interbank Offered Rate (LIBOR) [Member] Debt Debt Instrument [Line Items] Credit facility terminated Line of Credit Facility, Terminated Represents the information related to termination of credit facility. Percentage added to reference rate Debt Instrument, Basis Spread on Variable Rate Interest rate at period end (percentage) Line of Credit Facility, Interest Rate at Period End Available borrowing capacity Line of Credit Facility, Remaining Borrowing Capacity Amount outstanding Long-term Line of Credit Summary of the basic and diluted income per share Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Legal Proceedings Legal Matters and Contingencies [Text Block] Document and Entity Information Entity Registrant Name Entity Registrant Name Entity Central Index Key Entity Central Index Key Document Type Document Type Document Period End Date Document Period End Date Amendment Flag Amendment Flag Current Fiscal Year End Date Current Fiscal Year End Date Entity Current Reporting Status Entity Current Reporting Status Entity Filer Category Entity Filer Category Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Document Fiscal Year Focus Document Fiscal Year Focus Document Fiscal Period Focus Document Fiscal Period Focus Statement of Cash Flows [Abstract] Operating activities Net Cash Provided by (Used in) Operating Activities [Abstract] Adjustments to reconcile net loss to net cash used in operating activities: Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Stock compensation expense Share-based Compensation Provision for inventory allowance Inventory Write-down Provision for doubtful accounts Provision for Doubtful Accounts Incremental tax loss from exercise of common stock options Excess Tax Cost From Share Based Compensation Operating Activities Amount of cash inflow/outflow for realized tax provision related to deductible compensation cost reported on the entity's tax return for equity instruments in excess of the compensation cost for those instruments recognized for financial reporting purposes. Change in fair value of financial instruments Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) Changes in operating assets and liabilities: Increase (Decrease) in Operating Capital [Abstract] Accounts receivable Increase (Decrease) in Accounts Receivable Inventory Increase (Decrease) in Inventories Prepaid and deferred taxes Increase Decrease In Prepaid Taxes And Deferred Income Tax Expense Benefit Represents the combined amount of increase (decrease) of consideration paid in advance for income and other taxes that provide economic benefits in future periods and deferred income tax expense (benefit) pertaining to income (loss) from continuing operations. Prepaid expenses and other assets Increase (Decrease) in Prepaid Expense and Other Assets Accounts payable Increase (Decrease) in Accounts Payable Accrued expenses and other current liabilities Increase (Decrease) in Accrued Liabilities and Other Operating Liabilities Distributions payable Increase (Decrease) in Profit Sharing Distributions Payable The Net change in disbursement made as per the profit sharing arrangements after deducting the allowable operating expenses. Customer payables Increase (Decrease) in Customer Payables The net change during the reporting period in the amount of cash held on behalf of the sellers in the case of consignment sales transactions. Other liabilities Increase (Decrease) in Other Operating Liabilities Net cash used in operating activities Net Cash Provided by (Used in) Operating Activities Investing activities Net Cash Provided by (Used in) Investing Activities, Continuing Operations [Abstract] Increase in intangibles Increase (Decrease) in Intangible Assets, Current Purchases of property and equipment, including capitalized software Payments to Acquire Property, Plant, and Equipment Net cash used in investing activities Net Cash Provided by (Used in) Investing Activities Financing activities Net Cash Provided by (Used in) Financing Activities, Continuing Operations [Abstract] Proceeds from exercise of common stock options (net of tax) Proceeds from Stock Options Exercised Incremental tax loss from exercise of common stock options Excess Tax Provision From Share Based Compensation Financing Activities Amount of cash outflow from realized tax provision related to deductible compensation cost reported on the entity's tax return for equity instruments in excess of the compensation cost for those instruments recognized for financial reporting purposes. Net cash provided (used) by financing activities Net Cash Provided by (Used in) Financing Activities Effect of exchange rate differences on cash and cash equivalents Effect of Exchange Rate on Cash and Cash Equivalents Net decrease in cash and cash equivalents Cash and Cash Equivalents, Period Increase (Decrease) Cash and cash equivalents at beginning of period Cash and cash equivalents at end of period Supplemental disclosure of cash flow information Supplemental Cash Flow Information [Abstract] Cash paid for income taxes, net Income Taxes Paid, Net Fair Value Measurements, Recurring and Nonrecurring [Table] Fair Value Measurements, Recurring and Nonrecurring [Table] Measurement Frequency [Axis] Measurement Frequency [Axis] Fair Value, Measurement Frequency [Domain] Fair Value, Measurement Frequency [Domain] Recurring basis Fair Value, Measurements, Recurring [Member] Fair Value, Hierarchy [Axis] Fair Value, Hierarchy [Axis] Fair Value Hierarchy [Domain] Fair Value Hierarchy [Domain] Level 3 Fair Value, Inputs, Level 3 [Member] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] Balance at September 30, 2016 Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value Acquisition of financial assets Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases Settlements Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements Change in fair value of financial instruments Balance at December 31, 2016 Guarantees Guarantees [Text Block] Schedule of Finite-Lived Intangible Assets [Table] Schedule of Finite-Lived Intangible Assets [Table] Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets, Major Class Name [Domain] Finite-Lived Intangible Assets, Major Class Name [Domain] Contract intangibles Contractual Rights [Member] Brand and technology Brand Assets And Developed Technology Rights [Member] Represents information pertaining to brand assets and developed technology rights. Covenants not to compete Noncompete Agreements [Member] Patent and trademarks Patents And Trademarks [Member] Represents rights acquired through registration of a trademark to gain or protect exclusive use of a business name, symbol or other device or style and exclusive legal right granted by the government to the owner of the patent to exploit an invention or a process for a period of time specified by law. Finite-Lived Intangible Assets [Line Items] Finite-Lived Intangible Assets [Line Items] Useful Life (in years) Finite-Lived Intangible Asset, Useful Life Gross Carrying Amount Finite-Lived Intangible Assets, Gross Accumulated Amortization Finite-Lived Intangible Assets, Accumulated Amortization Contractors [Abstract] Schedule of Collaborative Arrangements and Non-collaborative Arrangement Transactions [Table] Schedule of Collaborative Arrangements and Non-collaborative Arrangement Transactions [Table] Concentration Risk Benchmark [Axis] Concentration Risk Benchmark [Axis] Concentration Risk Benchmark [Domain] Concentration Risk Benchmark [Domain] Sales Revenue, Net Sales Revenue, Net [Member] Type of Arrangement and Non-arrangement Transactions [Axis] Type of Arrangement and Non-arrangement Transactions [Axis] Arrangements and Non-arrangement Transactions [Domain] Arrangements and Non-arrangement Transactions [Domain] Surplus Contract Surplus Contract [Member] Represents the surplus contract entered into by the entity. Scrap Contract Scrap Contract [Member] Represents the scrap contract entered into by the entity. Commercial Client Commercial Client [Member] Commercial Client [Member] Products and Services [Axis] Products and Services [Axis] Products and Services [Domain] Products and Services [Domain] Non-rolling stock Nonrolling Stock Surplus Contract [Member] Represents the non-rolling stock surplus contract entered into by the entity. Concentration Risk Type [Axis] Concentration Risk Type [Axis] Concentration Risk Type [Domain] Concentration Risk Type [Domain] U.S. Department of Defense Government Contracts Concentration Risk [Member] Customer Concentration Risk Customer Concentration Risk [Member] Significant Contracts Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] Usable surplus property to be purchased as a fixed percentage of DoD's original acquisition value Usable Surplus Property to be Purchased as Percentage of Original Acquisition Value Represents the fixed percentage of DoD's original acquisition value at which the entity is required to purchase all usable surplus property offered to it by the Department of Defense. Profits from resale of the property retained (as a percent) Percentage of Profits Retained Represents the percentage of profits from resale of the property retained by the entity. Liability for inventory included in accrued expenses and other current liabilities Base period Base Period Represents the base period of the initial agreement ending in December 2016. Term of each renewal options extended Renewal options extended term Represents the term of renewal options extended, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Number of renewal options Number of Renewal Options Represents the number of renewal options in a contract entered into by the entity. Percentage of revenue Concentration Risk, Percentage Term of contract Contract Term Represents the term of the contract, in PnYnMnDTnHnMnS format, for example, P1Y5M13D represents the reported fact of one year, five months, and thirteen days. Adjusted percentage of profit sharing distribution Adjusted percentage of profit sharing distribution Represents the adjusted percentage of profits sharing distribution to the DLA Disposition Services by the entity. Organization Nature of Operations [Text Block] Summary of goodwill activity Schedule of Goodwill [Table Text Block] Goodwill Goodwill [Roll Forward] Balance at the beginning of the period Translation adjustments Goodwill, Translation Adjustments Balance at the end of the period Fair Value Measurement Fair Value Disclosures [Text Block] Earnings per Share Earnings Per Share [Abstract] Weighted average shares calculation: Weighted Average Number of Shares Outstanding Reconciliation [Abstract] Basic weighted average shares outstanding Weighted Average Number of Shares Outstanding, Basic Diluted weighted average common shares outstanding Weighted Average Number of Shares Outstanding, Diluted Restricted share activity Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] Unvested restricted shares at the beginning of the period Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number Restricted shares granted Restricted shares vested Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period Restricted shares cancelled Unvested restricted shares at the end of the period Weighted-Average Fair Value Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract] Unvested restricted shares at the beginning of the period (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value Restricted shares vested (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value Restricted shares cancelled (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value Unvested restricted shares at the end of the period (in dollars per share) Summary of stock option activity Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block] Summary of restricted share activity Schedule of Nonvested Share Activity [Table Text Block] Income Taxes Income Tax Disclosure [Text Block] Unaudited Interim Financial Information Basis of Accounting, Policy [Policy Text Block] New Accounting Pronouncements New Accounting Pronouncements, Policy [Policy Text Block] Business Combinations Business Combinations Policy [Policy Text Block] Accounts Receivable Trade and Other Accounts Receivable, Policy [Policy Text Block] Inventory Inventory, Policy [Policy Text Block] Prepaid expenses and other current assets Fair Value of Financial Instruments, Policy [Policy Text Block] Other Assets Receivables, Policy [Policy Text Block] Earnings per Share Earnings Per Share, Policy [Policy Text Block] Stock-Based Compensation Share-based Compensation, Option and Incentive Plans Policy [Policy Text Block] Significant Contracts Long-term Contracts or Programs Disclosure [Text Block] Summary of Significant Accounting Policies Significant Accounting Policies [Text Block] Schedule of intangible assets Schedule of Finite-Lived Intangible Assets [Table Text Block] Schedule of future expected amortization of intangible assets Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block] Level 1 Fair Value, Inputs, Level 1 [Member] Level 2 Fair Value, Inputs, Level 2 [Member] Fair value measurement Assets, fair value Assets, Fair Value Disclosure Liabilities, fair value Financial and Nonfinancial Liabilities, Fair Value Disclosure Impairment of goodwill Goodwill, Impairment Loss Schedule of net periodic benefit cost recognized Schedule of Net Benefit Costs [Table Text Block]