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Significant Accounting Policies (Tables) | 12 Months Ended
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Mar. 30, 2013
Significant Accounting Policies [Abstract] |
Company's sales mix |
| Year Ended Fiscal March
| 2013 |  | 2012 |  | 2011 |
Brakes | 15% |  | 18% |  | 18% |
Exhaust | 4 |  | 5 |  | 5 |
Steering | 10 |  | 10 |  | 11 |
Tires | 42 |  | 39 |  | 38 |
Maintenance | 29 |  | 28 |  | 28 |
Total | 100% |  | 100% |  | 100% |
Weighted average fair value of options assumptions |
| Year Ended Fiscal March
| 2013 |  | 2012 |  | 2011
Risk-free interest rate | .53 | % |  | 1.11 | % |  | 1.52 | %
Expected life, in years | 4 |  |  | 4 |  |  | 4 |
Expected volatility | 34.0 | % |  | 33.9 | % |  | 35.1 | %
Expected dividend yield | 1.14 | % |  | 1.03 | % |  | 0.93 | %

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- Definition Tabular disclosure of product information that are included in the discussion of the nature of an entity's operations. + References No definition available. + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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