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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