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. Loss On Property And Other Assets Loss on property and other assets - net The charge against earnings resulting from the aggregate write down of all assets from their carrying value to their fair value or the difference between the sale price or salvage price and the book value of an asset that was sold or retired during the reporting period (refers to the gain/loss and not to the cash proceeds of the sale). This element is a noncash adjustment to net income when calculating net cash generated by operating activities using the indirect method. 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 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. Fair Value Measurements And Disclosures [Policy Text Block] Fair Value Measurements Describes the entity's accounting policy for fair value measurements. 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. Asset Held For Sale, Long Lived Fair Value Disclosure Long-lived assets that are held for sale apart from normal operations and anticipated to be sold in less than one year. Excess properties 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. Assets Held For Use [Abstract] Assets held-for-use: Operating Locations, Fair Value Disclosure Operating locations Asset group used in the determination of long-lived asset impairment relating to operating locations that are held by an entity for use in the production or supply of goods and services, for rental to others, or for administrative purposes and that are expected to provide economic benefit for more than one year; net of accumulated depreciation. Locations Indentified for Closure, Fair Value Disclosure Locations indentified for closure Asset group used in the determination of long-lived asset impairment relating to locations identified for closure that are held by an entity for use in the production or supply of goods and services, for rental to others, or for administrative purposes and that are expected to provide economic benefit for more than one year; net of accumulated depreciation. Excess Property, Fair Value Disclosure Excess properties Asset group used in the determination of long-lived asset impairment relating to excess properties that are held by an entity for use in the production or supply of goods and services, for rental to others, or for administrative purposes and that are expected to provide economic benefit for more than one year; net of accumulated depreciation. 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. Assets, Fair Value Disclosures, Nonrecurring Total This element represents the aggregate of the assets measured at fair value on a nonrecurring basis during the period by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. 2021 and 2041 Combined Notes [Member] An obligation resulting from borrowing money. Two Thousand Twenty One And Two Thousand Forty One Combined Notes [Member] 2021 Notes [Member] An obligation resulting from borrowing money. Two Thousand Twenty One Notes Issued 2011 [Member] 2041 Notes [Member] An obligation resulting from borrowing money. Two Thousand Forty One Notes [Member] U S Line of Credit Facility 2012 [Member] US Line of Credit Facility 2012 [Member] Information pertaining to the Company's U.S. line of credit facility. Line Of Credit Facility Number Of Participating Banks Disclosure of the number of banks participating in the entity's credit facility. Number of participating banks Line Of Credit Facility Letter Of Credit Sub Limit The maximum amount of borrowing capacity under the letter of credit sublimit associated with the credit facility. Amounts outstanding under the letter of credit sublimit reduce the amount available for borrowing under the credit facility. Letter of credit sublimit U S Line of Credit Facility 2016 [Member] Information pertaining to the Company's U.S line of credit facility. US Line of Credit Facility 2016 [Member] Impairment, Store Closings and Discontinued Projects Charges [Abstract] Charges Impairment, Store Closings and Discontinued Projects Charges Store Closings and Discontinued Projects Charges [Table] Table presenting the description of the charges associated with store closing and discontinued projects pursuant to a duly authorized plan. Store Closings and Discontinued Projects [Axis] Quantitative and qualitative information pertaining to store closing and discontinued projects. Store Closings and Discontinued Projects [Domain] Identification of the store closing and discontinued projects activities. Store Closings and Discontinued Projects [Member] Charges associated with store closings and discontinued projects pursuant to a duly authorized plan. Store Closing Charges Total Amount charged against earnings in the period for incurred and estimated costs associated with exit from or disposal of business activities pursuant to a duly authorized plan, including asset impairment charges. Store closings and discontinued project charges Store Closings and Discontinued Projects [Line Items] Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. Store Closings and Discontinued Projects by Type of Cost [Text Block] Tabular disclosure of the amount charged against earnings in the period for incurred and estimated costs associated with exit from or disposal of business activities pursuant to a duly authorized plan, including asset impairment charges. Store closings and discontinued projects charges 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. Amendment Flag Current Fiscal Year End Date Document Period End Date Entity Well-known Seasoned Issuer Entity Voluntary Filers Entity Current Reporting Status Entity Filer Category Entity Public Float Entity Registrant Name Entity Central Index Key Entity Common Stock, Shares Outstanding Document Fiscal Year Focus Document Fiscal Period Focus Document Type