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Significant Accounting Policies (Details Textual) (USD $) In Millions, except Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 24, 2011 | Mar. 31, 2012 Triggering_Events Store | Mar. 26, 2011 | Mar. 27, 2010
Significant Accounting Policies (Textual) [Abstract] |  |  |  |
Company operated stores |  | 803 |  |
Franchised locations |  | 3 |  |
Dealer-operated automotive repair centers |  | 14 |  |
Company reported results minimum |  | 52 weeks |  |
Company reported results maximum |  | 53 weeks |  |
Company reported results actual |  | 53 weeks | 52 weeks | 52 weeks
Maturity period of cash equivalents |  | three months or less |  |
Impairments as a result of impairment tests | $ 0 |  |  |
Number of triggering events |  | 0 |  |
Number of shares surrendered in settlement of stock options exercised |  | 386,000 | 50,000 | 138,000
Number of stock options exercised in settlement of surrendered shares |  | 563,000 | 90,000 | 180,000
Vesting period for option awards |  | 4 years |  |
Weighted average fair value of options granted |  | $ 8.41 | $ 8.58 | $ 5.38
Stock based compensation expense |  | 2.7 | 2.3 | 2.0
Income tax benefit related to stock based compensation |  | $ 1.0 | $ 0.9 | $ 0.8
Stock split conversion ratio |  |  | three-for-two |
Stock dividend as a result of a stock split |  |  | 50.00% |
Advertising expenses amortization period, minimum |  | 6 weeks |  |
Advertising expenses amortization period, maximum |  | 1 year |  |
Buildings and Improvements [Member] |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Property, Plant and Equipment, Useful Life, Minimum, years |  | 10 |  |
Property, Plant and Equipment, Useful Life, Maximum, years |  | 39 |  |
Machinery and Equipment [Member] |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Property, Plant and Equipment, Useful Life, Minimum, years |  | 5 |  |
Property, Plant and Equipment, Useful Life, Maximum, years |  | 15 |  |
Vehicles [Member] |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Property, Plant and Equipment, Useful Life, Minimum, years |  | 5 |  |
Property, Plant and Equipment, Useful Life, Maximum, years |  | 10 |  |
Software [Member] |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Property, Plant and Equipment, Useful Life, Minimum, years |  | 3 |  |
Property, Plant and Equipment, Useful Life, Maximum, years |  | 7 |  |

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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph c(1) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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