Significant Accounting Policies Textual (Details) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended
	Mar. 30, 2013 numberofautomotiverepaircenters numberofstores numberoffranchiselocations	Mar. 31, 2012 numberofstores numberofautomotiverepaircenters numberoffranchiselocations	Mar. 26, 2011
Significant Accounting Policies (Textual) [Abstract]
Company operated stores	937
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	52 weeks	53 weeks	52 weeks
Maturity period of cash equivalents	three months or less
Impairments as a result of impairment tests	$ 0
Number of shares surrendered in settlement of stock options exercised	112,000	386,000	50,000
Number of stock options exercised in settlement of surrendered shares	113,000	563,000	90,000
Vesting period for option awards	4 years
Weighted average fair value of options granted	$ 8.67	$ 8.41	$ 8.58
Stock based compensation expense	3.1	2.7	2.3
Income tax benefit related to stock based compensation	$ 1.2	$ 1.0	$ 0.9
Stock split conversion ratio			three-for-two
Stock dividend as a result of a stock split			50.00%
Advertising expenses amortization period, minimum	42 days
Advertising expenses amortization period, maximum	1 year
Buildings and Improvements [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life, Maximum, years	39 years
Buildings and Improvements [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life, Maximum, years	10 years
Machinery and Equipment [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life, Maximum, years	15 years
Machinery and Equipment [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life, Maximum, years	5 years
Vehicles [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life, Maximum, years	10 years
Vehicles [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life, Maximum, years	5 years
Software [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life, Maximum, years	7 years
Software [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life, Maximum, years	3 years