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Significant Accounting Policies (Tables) | 12 Months Ended
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Mar. 31, 2012
Significant Accounting Policies [Abstract] |
Company's sales mix |
|  | Year Ended Fiscal March |
|  | 2012 |  |  | 2011 |  |  | 2010 |
Brakes |  |  | 18 | % |  |  | 18 | % |  |  | 19 | %
Exhaust |  |  | 5 |  |  |  | 5 |  |  |  | 6 |
Steering |  |  | 10 |  |  |  | 11 |  |  |  | 11 |
Tires |  |  | 39 |  |  |  | 38 |  |  |  | 34 |
Maintenance |  |  | 28 |  |  |  | 28 |  |  |  | 30 |
Total |  |  | 100 | % |  |  | 100 | % |  |  | 100 | %
Weighted average fair value of options assumptions |
|  | Year Ended Fiscal March |
|  | 2012 |  |  | 2011 |  |  | 2010 |
Risk-free interest rate |  |  | 1.11 | % |  |  | 1.52 | % |  |  | 2.24 | %
Expected life, in years |  |  | 4 |  |  |  | 4 |  |  |  | 5 |
Expected volatility |  |  | 33.9 | % |  |  | 35.1 | % |  |  | 32.8 | %
Expected dividend yield |  |  | 1.03 | % |  |  | .93 | % |  |  | 1.04 | %

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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 -Topic 718 -SubTopic 10 -Publisher FASB -Number -Article -Subparagraph (f)(2) -Name Accounting Standards Codification -Paragraph 2 -Section 50 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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