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Significant Accounting Policies (Company's sales mix) (Details) | 12 Months Ended
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Mar. 31, 2018 | Mar. 25, 2017 | Mar. 26, 2016
Company's sales mix |  |  |
Revenue recognition | 100.00% | 100.00% | 100.00%
Brakes [Member] |  |  |
Company's sales mix |  |  |
Revenue recognition | 13.00% | 13.00% | 15.00%
Exhaust [Member] |  |  |
Company's sales mix |  |  |
Revenue recognition | 2.00% | 2.00% | 3.00%
Steering [Member] |  |  |
Company's sales mix |  |  |
Revenue recognition | 8.00% | 9.00% | 10.00%
Tires [Member] |  |  |
Company's sales mix |  |  |
Revenue recognition | 50.00% | 49.00% | 45.00%
Maintenance [Member] |  |  |
Company's sales mix |  |  |
Revenue recognition | 27.00% | 27.00% | 27.00%

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