Significant Accounting Policies (Narrative) (Details) $ / shares in Units, $ in Millions	12 Months Ended
	Mar. 25, 2017 USD ($) state segment property store item $ / shares	Mar. 26, 2016 USD ($) $ / shares shares	Mar. 28, 2015 USD ($) $ / shares shares
Significant Accounting Policies [Line Items]
Company operated stores | store	1,118
Franchised locations | store	114
Number of wholesale locations | property	5
Number of retread facilities | property	2
Dealer-operated automotive repair centers | store	14
Number of States in which Entity Operates | state	27
Number of operating segments | segment	1
Number of reporting units | item	1
Weighted average fair value of options granted | $ / shares	$ 12.17	$ 13.10	$ 11.27
Stock based compensation expense | $	$ 2.5	$ 2.8	$ 3.3
Income tax benefit related to stock based compensation | $	$ 1.0	$ 1.0	$ 1.2
Advertising expenses amortization period	2 months
Store leases not recorded on balance sheet, percent	50.00%
Property Lease Guarantee [Member]
Significant Accounting Policies [Line Items]
Maximum potential guarantee payments | $	$ 7.5
Liability for anticipated lease defaults | $	$ 0.6
Employee Stock Option [Member]
Significant Accounting Policies [Line Items]
Options award vesting period	4 years
Chief Executive Officer [Member]
Significant Accounting Policies [Line Items]
Number of shares surrendered in settlement of stock options exercised | shares		32,000	77,000
Number of stock options exercised in settlement of surrendered shares | shares		89,000	113,000
Board of Directors Chairman [Member]
Significant Accounting Policies [Line Items]
Number of shares surrendered in settlement of stock options exercised | shares		100,000
Number of stock options exercised in settlement of surrendered shares | shares		150,000
Buildings and Improvements [Member] | Maximum [Member]
Significant Accounting Policies [Line Items]
Useful lives	39 years
Buildings and Improvements [Member] | Minimum [Member]
Significant Accounting Policies [Line Items]
Useful lives	10 years
Machinery, Fixtures And Equipment [Member] | Maximum [Member]
Significant Accounting Policies [Line Items]
Useful lives	15 years
Machinery, Fixtures And Equipment [Member] | Minimum [Member]
Significant Accounting Policies [Line Items]
Useful lives	3 years
Vehicles [Member] | Maximum [Member]
Significant Accounting Policies [Line Items]
Useful lives	10 years
Vehicles [Member] | Minimum [Member]
Significant Accounting Policies [Line Items]
Useful lives	4 years
Computer Hardware And Software [Member] | Maximum [Member]
Significant Accounting Policies [Line Items]
Useful lives	7 years
Computer Hardware And Software [Member] | Minimum [Member]
Significant Accounting Policies [Line Items]
Useful lives	3 years