Sales Revenue Net Percent Percentage of Total Sales Net sales Net sales as a percentage of net sales. Cost Of Goods And Services Sold Percent Cost of sales Cost of sales as a percentage of net sales. Gross Profit Percent Gross margin Gross margin as a percentage of net sales. Selling General And Administrative Expense Percent Selling, general and administrative Selling, general and administrative expense as a percentage of net sales. Depreciation Nonproduction Percent Depreciation Depreciation as a percentage of net sales. Interest Expense Percent Interest - net Interest - net as a percentage of net sales. Operating Expenses Percent Total expenses Total expenses as a percentage of net sales. Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments Percent Pre-tax earnings Pre tax earnings as a percentage of net sales. Income Tax Expense Benefit Percent Income tax provision Income tax provision as a percentage of net sales. Profit Loss Percent Net earnings Net earnings as a percentage of net sales. Net earnings Document and Entity Information [Abstract] Stock Repurchased And Retired During Period, Share Share repurchase program, shares Number of shares that have been repurchased and retired during the period under the share repurchase program. Adjustments To Retained Earnings Share Repurchase Share repurchases Reduction in retained earnings Adjustment to the reporting entity's retained earnings that represents amounts paid to purchase shares in excess of the cumulative balance of capital in excess of par value. Remaining Share Repurchases Authorization Remaining authorization under share repurchase program The amount of authorization remaining under the share repurchase program after deducting all repurchases made under the program. Stock Repurchased And Retired During Period, Values Share repurchase program, value Value of stock that has been repurchased and retired during the period under the share repurchase program. Accrual for claims incurred Represents the accruals for claims that are incurred per the terms of the extended warranty contract. Accrual for claims incurred Deferred Revenue from Sales of Extended Warranty Contracts Deferred revenue - extended protection plans, end of period Deferred revenue - extended protection plans, beginning of period Deferred revenue - extended protection plans Amount of deferred revenue from sales of extended warranty contracts as of balance sheet date. Deferred revenue represents collection of cash where revenue has not yet been recognized. Deferred Revenue Additions From Sales of Extended Warranty Contracts Additions to deferred revenue Amount of deferred revenue from sales of extended warranty contracts during the current reporting period. Deferred Revenue Recognized from Sales of Extended Warranty Contracts Deferred revenue recognized Amount of previously reported "Additions to deferred revenue" from sales of extended warranty contracts that was recognized as revenue during the period. Profit Loss Allocable Participating Securities, Basic Less: Net earnings allocable to participating securities The consolidated profit or loss for the period, net of income taxes, allocated to participating securities other than common shares for the purpose of computing basic earnings per share, based upon actual dividends declared and the allocable share of undistributed earnings to the holders. Profit Loss Allocable Participating Securities, Diluted Less: Net earnings allocable to participating securities The consolidated profit or loss for the period, net of income taxes, allocated to participating securities other than common shares for the purpose of computing diluted earnings per share, based upon actual dividends declared and the allocable share of undistributed earnings to the holders. Profit Loss Allocable Common Share, Basic Net earnings allocable to common shares The consolidated profit or loss for the period, net of income taxes, allocated to common shares for the purpose of computing basic earnings per share, based upon actual dividends declared and the allocable share of undistributed earnings to the holders to the holders of those common shares. Profit Loss Allocable Common Share, Diluted Net earnings allocable to common shares The consolidated profit or loss for the period, net of income taxes, allocated to common shares for the purpose of computing diluted earnings per share, based upon actual dividends declared and the allocable share of undistributed earnings to the holders to the holders of those common shares. Supplemental Disclosure [Abstract] Supplemental Disclosure Deferred Income Tax Expense Benefit Excluding Share Based Payment Shortfall Deferred income taxes The component of income tax expense for the period representing the net change in the entity's deferred tax assets and liabilities pertaining to continuing operations excluding share-based payment excess tax shortfall. Net Interest Expense [Text Block] Net interest expense Tabular disclosure of the components of net interest expense. Deferred Costs Associated With Extended Warranty Contracts Deferred costs associated with extended protection plan contracts Gross amount of deferred costs associated with extended warranty contracts yet to be recognized at the end of the reporting period. Changes In Liability For Extended Warranty Claims [Text Block] Changes in the liability for extended protection plan claims Changes in the carrying value of obligations incurred through the balance sheet date for estimated claims under extended warranty contracts. Changes In Deferred Revenue From Extended Warranty Sales [Text Block] Changes in deferred revenue for extended protection plan contracts Rollforward of entire balance of deferred revenue from sales of extended warranty contracts through the balance sheet date. Deferred revenue from sales of extended warranty contracts is a liability; revenue has not yet been recognized. Generally, an entity records deferred revenue from sales of extended warranty contracts when it receives consideration from a customer before achieving certain criteria that must be met for revenue to be recognized in conformity with GAAP. Money Market Funds, Fair Value Money market funds Fair value of investment in a fund that has underlying investments in short-term money-market instruments, such as commercial paper, banker's acceptances, repurchase agreements, government securities, certificates of deposit, and other highly liquid and safe securities and pays money market rates of interest. Floating Rate Obligations Short Term Municipal floating rate obligations Fair value of short term debt securities for which the interest rate resets periodically at predetermined dates. Certain of these securities also permit the holder to require the trustee or tender agent to repurchase the security at specified interest rate reset dates before maturity. Other Debt Securities, Fair Value Other Fair value of investments in short-term debt securities which are not otherwise provided for in the existing taxonomy in the form of Domain Members or individual elements. Mutual Funds, Fair Value Mutual funds Fair value of professionally managed collective investment schemes that pool money from many investors and invest typically in investment securities (stocks, bonds, short-term money market instruments, other mutual funds, other securities, and/or commodities such as precious metals). Floating Rate Obligations, Long Term Municipal floating rate obligations Fair value of long term debt securities for which the interest rate resets periodically at predetermined dates. Certain of these securities also permit the holder to require the trustee or tender agent to repurchase the security at specified interest rate reset dates before maturity. Other Long Term Debt Securities Fair Value Other Fair value of other long-term investments in debt securities which are not otherwise provided for in the existing taxonomy in the form of domain members or individual elements. U S States And Political Subdivisions, Short Term, Fair Value Municipal obligations Fair value of bonds or similar securities issued by state, city, or local governments or the agencies operated by state, city, or local governments expected to be held for less than one year. Debt securities issued by state governments may include bond issuances of US state authorities including, for example, Housing Authorities, Dormitory Authorities, and General Obligations while debt securities issued by political subdivisions of US states would include, for example, debt issuances by county, borough, city, or municipal governments. U S States And Political Subdivisions, Long Term, Fair Value Municipal obligations Fair value of bonds or similar securities issued by state, city, or local governments or the agencies operated by state, city, or local governments expected to be held for more than one year. Debt securities issued by state governments may include bond issuances of US state authorities including, for example, Housing Authorities, Dormitory Authorities, and General Obligations while debt securities issued by political subdivisions of US states would include, for example, debt issuances by county, borough, city, or municipal governments. Schedule of Share Repurchases [Table Text Block] Schedule of share repurchases Tabular disclosure of the number of shares repurchased during the period, including the corresponding cost. Non-cash employee stock option exercises Non-cash employee stock option exercises The non-cash value associated with employees exercising their stock options in a cashless exercise, whereby within the exercise transaction the company repurchases the number of shares necessary to cover the proceeds receivable from the employee. 2017, 2022 and 2042 Combined Notes [Member] An obligation resulting from borrowing money. Two Thousand Seventeen Two Thousand Twenty Two And Two Thousand Forty Two Combined Notes [Member] 2022 Notes [Member] An obligation resulting from borrowing money. Two Thousand Twenty Two Notes Issued 2012 [Member] 2042 Notes [Member] An obligation resulting from borrowing money. Two Thousand Forty Two Notes Issued 2012 [Member] Share Repurchase Program, Authorized Amount Amount authorized under share repurchase program The amount authorized by an entity's Board of Directors under a stock repurchase plan. Gain Loss On Sales Of Assets And Asset Impairment Charges Loss on property and other assets - net Amount of gain (loss) from the difference between the sale price or salvage price and the book value of an asset that was sold or retired, and gain (loss) from the write down of assets from their carrying value to fair value. Fair Value Measurement Policy Policy [Text Block] Fair Value Measurements Disclosure of accounting policy for fair value measurements, which may include, but is not limited to, how an entity that manages a group of financial assets and liabilities on the basis of its net exposure measures the fair value of those assets and liabilities. Two Thousand Seventeen Notes Issued 2012 [Member] 2017 Notes [Member] An obligation resulting from borrowing money. Other Comprehensive Income Foreign Currency Transaction And Translation Gain Loss Arising During Period Net Of Tax Percent Foreign currency translation adjustments as a percentage of net sales. Foreign currency translation adjustments Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax Percent Net unrealized investment gains (losses) as a percentage of net sales. Net unrealized investment gains Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest Percent Comprehensive income as a percentage of net sales. Comprehensive income Fair Value Level 1 [Member] Fair Value (Level 1) This element represents the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined) for which it is practicable to estimate such value, categorized within level 1 of the fair value hierarchy. Fair Value Level 2 [Member] Fair Value (Level 2) This element represents the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined) for which it is practicable to estimate such value, categorized within level 2 of the fair value hierarchy. Other Comprehensive Income (Loss), Net of Tax Other comprehensive income Net of tax amount of other comprehensive income (loss) attributable to both parent entity and noncontrolling interest. Other Comprehensive Income (Loss), Net Of Tax Percent Other comprehensive income as a percentage of net sales. Other comprehensive income Accumulated Other Comprehensive Income (Loss), Net of Tax Accumulated Other Comprehensive Income (Loss), Net of Tax, Ending Balance Accumulated Other Comprehensive Income (Loss), Net of Tax, Beginning Balance Accumulated other comprehensive income Accumulated other comprehensive income Accumulated depreciation Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment, Ending Balance Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment, Beginning Balance Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment, Total Additional Paid in Capital, Common Stock Additional Paid in Capital, Common Stock, Ending Balance Additional Paid in Capital, Common Stock, Beginning Balance Capital in excess of par value Consolidated Balance Sheets Earnings Per Share, Basic Basic earnings per common share Basic earnings per common share Capitalized lease obligations Cash and Cash Equivalents, at Carrying Value Cash and cash equivalents, end of period Cash and cash equivalents, beginning of period Cash and Cash Equivalents, at Carrying Value, Total Cash and cash equivalents Interest Paid, Net, Total Cash paid for interest, net of amount capitalized Merchandise inventory - net Increase (Decrease) in Inventories Net cash provided by operating activities Accounts payable Changes in operating assets and liabilities: Common Stock, Shares, Issued Common Stock, Shares, Issued, Total Common stock, shares issued Common Stock, Shares, Outstanding Balance, shares Balance, shares Common stock, shares outstanding