Accounting Policies [Abstract] Accounting Policies [Abstract] Accounting Standards Update 2016-09 [Member] Accounting Standards Update 2016-09 Accounts, Notes, Loans and Financing Receivable [Line Items] Accounts, Notes, Loans and Financing Receivable [Line Items] Accounts Payable and Accrued Liabilities [Member] Accounts payable and accrued expenses Accounts Payable, Current Accounts payable Accounts Payable, Trade, Current Vendor invoices Accounts Receivable, Net, Current Accounts receivable, less allowances of $6,190 at December 31, 2017 and $5,725 at December 31, 2016 Accrued Acquisition Related Contingent Consideration Accrued Acquisition Related Contingent Consideration Contingent consideration related to acquisitions Accrued Expenses [Member] Accrued Expenses [Member] Accrued expenses Accrued Freight, Current Accrued Freight, Current Freight Accrued Income Taxes, Current Income taxes payable (Note J) Accrued Income Taxes, Noncurrent INCOME TAXES PAYABLE, LONG TERM (Note J) Accrued Liabilities, Current Accrued expenses (Note N) Total Accrued Liabilities [Line Items] Accrued Liabilities [Line Items] Accrued Liabilities [Line Items] Accrued Liabilities [Table] Accrued Liabilities [Table] Accrued Liabilities [Table] Accrued liability on foreign currency exchange contracts current. Accrued Liability on Foreign Currency Exchange Contracts Current Foreign exchange contracts Accrued Professional Fees, Current Professional fees Accrued Royalties, Current Royalties Accrued Sales Commission, Current Commissions Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] Accumulated effect of retirement benefit obligations: Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Accumulated depreciation and amortization Less: accumulated depreciation and amortization Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member] Accumulated deferred gains (losses) on cash flow hedges: Accumulated Other Comprehensive Income (Loss) [Line Items] Accumulated Other Comprehensive Income (Loss) [Line Items] Accumulated Other Comprehensive Income (Loss), Net of Tax Accumulated other comprehensive loss (Note N) Accumulated Other Comprehensive Income (Loss) [Table] Accumulated Other Comprehensive Income (Loss) [Table] AOCI Attributable to Parent [Member] Accumulated other comprehensive loss Accumulated Foreign Currency Adjustment Attributable to Parent [Member] Accumulated translation adjustment: Acquired Finite-lived Intangible Assets, Weighted Average Useful Life Finite-lived intangible assets, weighted-average amortization periods Additional Cash Flow Elements and Supplemental Cash Flow Information [Abstract] Additional Cash Flow Elements and Supplemental Cash Flow Information [Abstract] Additional Financial Information Disclosure [Text Block] OTHER Additional Paid in Capital Paid-in capital Additional Paid-in Capital [Member] Paid-in capital Adjustments for Error Correction [Domain] Adjustments for Error Correction [Domain] Adjustments for New Accounting Pronouncements [Axis] Adjustments for New Accounting Pronouncements [Axis] Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition Stock compensation expense (Note H) Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Adjustments to reconcile net income to net cash provided by operating activities: Adjustment to Additional Paid in Capital, Income Tax Effect from Share-based Compensation, Net Tax benefit (deficiency) from stock options, net Advertising Cost, Policy, Expensed Advertising Cost [Policy Text Block] Advertising expenses Advertising Expense Advertising expenses After Amendment [Member] After Amendment [Member] After Amendment Agreement Period Agreement Period Agreement period Agreement Period, Extension Term Agreement Period, Extension Term Agreement period, extension term Agreement Termination Notice Period Agreement Termination Notice Period Agreement termination, written notice period Allowance for Doubtful Accounts [Member] Allowance for Doubtful Accounts Allowance for Doubtful Accounts Receivable, Current Accounts receivable, allowances Allowance for Sales Returns [Member] Allowance for Sales Returns Amco Houseworks [Member] Amco Houseworks [Member] Amco Houseworks, Chicago Metallic and Swing-A-Way kitchenware and bakeware brands Amendment [Axis] Amendment [Axis] Amendment [Axis] Amendment [Domain] Amendment [Domain] Amendment [Domain] Amendment Flag Amendment Flag Amortization of Debt Issuance Costs Amortization of financing costs Amortization of Intangible Assets Amortization expenses Amortization Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Antidilutive Securities Excluded from Computation of Diluted Income Per Common Share Antidilutive Securities [Axis] Antidilutive Securities Antidilutive Securities, Name [Domain] Antidilutive Securities, Name [Domain] Arrangements and Non-arrangement Transactions [Domain] Arrangements and Non-arrangement Transactions [Domain] Assets Assets TOTAL ASSETS Assets [Abstract] ASSETS Assets, Current TOTAL CURRENT ASSETS Assets, Current [Abstract] CURRENT ASSETS Assets Held under Capital Leases [Member] Assets Held under Capital Leases Award Type [Axis] Award Type Balance Sheet Location [Axis] Balance Sheet Location [Axis] Balance Sheet Location [Domain] Balance Sheet Location [Domain] Basis of Accounting, Policy [Policy Text Block] Basis of presentation Basis of Presentation and Significant Accounting Policies [Text Block] SIGNIFICANT ACCOUNTING POLICIES Before Amendment [Member] Before Amendment [Member] Prior to Amendment Building and Building Improvements [Member] Building and Improvements Business Acquisition, Acquiree [Domain] Business Acquisition, Acquiree [Domain] Business Acquisition [Axis] Business Acquisition [Axis] Business Acquisition, Date of Acquisition Agreement Business acquisition, date of acquisition agreement Business Acquisition, Effective Date of Acquisition Business acquisition, effective date of acquisition Business Acquisition, Equity Interest Issued or Issuable, Number of Shares Business acquisition, equity interest issued or issuable, number of shares Business Acquisition [Line Items] Business Acquisition [Line Items] The amount of acquisition cost of a business combination allocated to an identifiable intangible asset that will be amortized and goodwill. Business Acquisition, Purchase Price Allocation, Intangible Assets and Goodwill Goodwill and other intangibles Business Combination, Consideration Transferred Aggregate acquisition agreement amount Business Combination, Consideration Transferred, Equity Interests Issued and Issuable Business combination, consideration transferred, equity interests issued and issuable Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability Contingent consideration fair value adjustment Business Combination Disclosure [Text Block] ACQUISITIONS Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual Net sales Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Receivables Accounts Receivable Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Inventory Inventory Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Other Other liabilities Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets Other assets Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net Total allocated value Business Combinations [Abstract] Business Combinations [Abstract] Capital Cost [Member] Capital Cost [Member] Capital cost Capital Lease Obligations, Noncurrent Capital lease obligations Cash and Cash Equivalents, at Carrying Value CASH AND CASH EQUIVALENTS AT END OF YEAR Cash and cash equivalents at beginning of year Cash and cash equivalents Cash and Cash Equivalents, Period Increase (Decrease) (DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS Cash and Cash Equivalents, Policy [Policy Text Block] Cash equivalents Cash Flow Hedging [Member] Cash Flow Hedging Class of Stock [Domain] Class of Stock [Domain] Collections Of Previously Sold Accounts Receivable Collections Of Previously Sold Accounts Receivable HSBC collection receipts Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Disclosure [Line Items] Commitments and Contingencies Disclosure [Line Items] Commitments and Contingencies Disclosure [Line Items] Commitments and Contingencies Disclosure [Table] Commitments and Contingencies Disclosure [Table] Commitments and Contingencies Disclosure [Table] Commitments and Contingencies Disclosure [Text Block] COMMITMENTS AND CONTINGENCIES Common Stock, Dividends, Per Share, Declared Dividend per share Quarterly dividend declared Common Stock [Member] Common Stock Common Stock, Par or Stated Value Per Share Common stock, par value Common Stock, Shares Authorized Common stock, shares authorized Common Stock, Shares, Issued Common stock, shares issued Common Stock, Shares, Outstanding Common stock, shares outstanding Common Stock, Value, Issued Common stock, $.01 par value, shares authorized: 50,000,000 at December 31, 2017 and 2016; shares issued and outstanding: 14,902,527 at December 31, 2017 and 14,555,936 at December 31, 2016 Retirement Benefits [Abstract] Retirement Benefits [Abstract] Components Of Deferred Tax Asset And Liabilities [Line Items] Components Of Deferred Tax Asset And Liabilities [Line Items] Components Of Deferred Tax Asset And Liabilities [Line Items] Components Of Deferred Tax Asset And Liabilities [Table] Components Of Deferred Tax Asset And Liabilities [Table] Components Of Deferred Tax Asset And Liabilities [Table] Components Of Earnings Loss Before Income Taxes [Line Items] Components Of Earnings Loss Before Income Taxes [Line Items] Components Of Earnings Loss Before Income Taxes [Line Items] Components Of Earnings Loss Before Income Taxes [Table] Components Of Earnings Loss Before Income Taxes [Table] Components Of Earnings Loss Before Income Taxes [Table] Components of Income Tax Expense (Benefit), Continuing Operations [Abstract] Current: Components Of Income Tax Expense Benefit [Line Items] Components Of Income Tax Expense Benefit [Line Items] Components Of Income Tax Expense Benefit [Line Items] Components Of Income Tax Expense Benefit [Table] Components Of Income Tax Expense Benefit [Table] Components Of Income Tax Expense Benefit [Table] Comprehensive Income (Loss), Net of Tax, Attributable to Parent Comprehensive income (loss) Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract] Comprehensive (loss) income: Concentration Risk Benchmark [Domain] Concentration Risk Benchmark [Domain] Concentration Risk Benchmark [Axis] Concentration Risk Benchmark [Axis] Concentration Risk Type [Axis] Concentration Risk Type [Axis] Concentration Risk, Credit Risk, Policy [Policy Text Block] Concentration of credit risk Concentration Risk, Percentage Percentage of net sales Concentration Risk Type [Domain] Concentration Risk Type [Domain] Consolidation Items [Axis] Consolidation Items [Axis] Consolidation Items [Domain] Consolidation Items [Domain] Consolidation, Policy [Policy Text Block] Principles of consolidation Construction in Progress, Gross Construction in progress Consulting Expense [Member] Consulting Expense [Member] Consulting expense Contractual Obligation Total Contractual Obligation, Due after Fifth Year Future minimum royalties payable under license agreements, Thereafter Contractual Obligation, Due in Fifth Year Future minimum royalties payable under license agreements, 2022 Contractual Obligation, Due in Fourth Year Future minimum royalties payable under license agreements, 2021 Contractual Obligation, Due in Next Fiscal Year Future minimum royalties payable under license agreements, 2018 Contractual Obligation, Due in Second Year Future minimum royalties payable under license agreements, 2019 Contractual Obligation, Due in Third Year Future minimum royalties payable under license agreements, 2020 Contractual Obligation [Line Items] Contractual Obligation [Line Items] Contractual Obligation [Line Items] Contractual Obligation [Table] Contractual Obligation [Table] Contractual Obligation [Table] Copco Product Line [Member] Copco Product Line [Member] Copco Product Line Corporate, Non-Segment [Member] Unallocated corporate expenses Costco Wholesale Corporation. Costco Wholesale Corporation [Member] Costco Wholesale Corporation Cost of Goods and Services Sold Cost of sales Cost of Sales, Policy [Policy Text Block] Cost of sales Costs Associated with Exit or Disposal Activities or Restructurings, Policy [Policy Text Block] Restructuring expenses Counterparty Name [Axis] Counterparty Name [Axis] Creative Tops [Member] Creative Tops [Member] Creative Tops Credit Concentration Risk [Member] Credit Concentration Risk Credit Facility [Axis] Credit Facility Credit Facility [Domain] Credit Facility [Domain] Current Federal Tax Expense (Benefit) Federal Current Fiscal Year End Date Current Fiscal Year End Date Current Foreign Tax Expense (Benefit) Foreign Current State and Local Tax Expense (Benefit) State and local Customer Relationships and Trade Names. Customer Relationships and Trade Names [Member] Customer Relationships and Trade Names Customer Relationships [Member] Customer Relationships Debt Disclosure [Abstract] Debt Disclosure [Abstract] Debt Disclosure [Text Block] DEBT Debt instrument additional stated amount if certain conditions met. Debt Instrument Additional Stated Amount if Certain Conditions Met Increase in line of credit facility Debt Instrument [Axis] Debt Instrument Debt Instrument, Date of First Required Payment Debt instrument, date of first required payment Debt Instrument, Description Line of credit facility, description Debt Instrument, Face Amount Debt instrument, face amount Debt Instrument [Line Items] Debt Instrument [Line Items] Debt Instrument, Maturity Date Debt instrument, maturity date Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Debt instrument quarterly repayment percentage of principal amount. Debt Instrument Quarterly Repayment Percentage of Principal Amount Debt instrument, interest rate, stated percentage Debt Instrument, Redemption, Period [Axis] Debt Instrument, Redemption, Period [Axis] Debt Instrument, Redemption, Period [Domain] Debt Instrument, Redemption, Period [Domain] Debt instruments maturity date month and year. Debt Instruments Maturity Date Month and Year Credit facility, maturity date Schedule of Long-term Debt Instruments [Table] Schedule of Long-term Debt Instruments [Table] Debt Related Commitment Fees and Debt Issuance Costs Financing expense Deferred Income Tax Expense (Benefit) Deferred income taxes Deferred Tax Liabilities, Gross Total deferred income tax liabilities Deferred Rent And Other Long Term Liability [Member] Deferred Rent And Other Long Term Liability [Member] Deferred rent & other long-term liabilities Deferred Rent Credit, Noncurrent Deferred rent liability Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from accrued compensation. Deferred Tax Assets, Accrued Compensation And Benefits Accrued compensation Deferred Tax Assets, Depreciation and Amortization Deferred Tax Assets, Depreciation and Amortization Depreciation and amortization Deferred Tax Assets, Gross Total deferred income tax assets Deferred Tax Assets, Gross [Abstract] Deferred income tax assets: Deferred Tax Assets, Inventory Inventory Deferred tax assets (liabilities), gross. Deferred Tax Assets (Liabilities), Gross Net deferred income tax asset Deferred Tax Assets, Net Net deferred income tax asset Deferred Tax Assets, Net, Classification [Abstract] Deferred income tax liabilities: Deferred Tax Assets, Net of Valuation Allowance, Noncurrent DEFERRED INCOME TAXES (Note J) Deferred Tax Assets, Operating Loss Carryforwards Operating loss carry-forward Deferred Tax Assets, Other Other Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Share-based Compensation Cost Stock options Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Allowance for Doubtful Accounts Accounts receivable allowances Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Deferred Rent Deferred rent expense Deferred Tax Assets, Valuation Allowance Valuation allowance Deferred tax liabilities (contra liability) investment in noncontrolled affiliates. Deferred Tax Liabilities, (Contra Liability) Investment in Noncontrolled Affiliates Equity in earnings Amount of deferred tax liability attributable to taxable temporary differences from depreciation and amortization. Deferred Tax Liabilities, Depreciation and Amortization Depreciation and amortization Deferred Tax Liabilities, Goodwill and Intangible Assets Intangibles Deferred Tax Liabilities, Net, Noncurrent DEFERRED INCOME TAXES (Note J) Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate Retirement benefit obligations discount rate Defined Benefit Plan, Benefit Obligation Retirement benefit obligations Defined Benefit Plan Disclosure [Line Items] Defined Benefit Plan Disclosure [Line Items] Defined Benefit Plan, Expected Amortization, Next Fiscal Year Expected actuarial losses included in accumulated other comprehensive loss in net periodic benefit cost in 2018 Defined Benefit Plan, Expected Future Benefit Payment, Five Fiscal Years Thereafter 2023 through 2027 Defined Benefit Plan, Expected Future Benefit Payment, Next Twelve Months 2018