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Significant Accounting Policies (Tables)
12 Months Ended
Mar. 29, 2014
Significant Accounting Policies [Abstract]  
Company's sales mix
 Year Ended Fiscal March
 2014 2013 2012 
Brakes15% 15% 18% 
Exhaust4 4 5 
Steering9 10 10 
Tires44 42 39 
Maintenance28 29 28 
Total100% 100% 100% 
Weighted average fair value of options assumptions
  Year Ended Fiscal March
 2014 2013 2012
         
Risk-free interest rate.86% .53% 1.11%
Expected life, in years4  4  4 
Expected volatility29.7% 34.0% 33.9%
Expected dividend yield.97% 1.14% 1.03%