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Capital stock (Tables) | 12 Months Ended
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Mar. 30, 2013
Equity [Abstract] |
Summary of Common Stock Outstanding |
|  | Class A common stock |  |  | Class B common stock |  |  | Total common stock |
|  | Number of Shares |  |  | Amount |  |  | Number of Shares |  |  | Amount |  |  | Number of Shares |  |  | Amount |
Balance as of March 26, 2011 |  |  | 3,672,535 |  |  | $ | 22,282 |  |  |  | 7,717,970 |  |  | $ | 38,613 |  |  |  | 11,390,505 |  |  | $ | 60,895 |
Exercise of stock options |  |  | 1,080 |  |  |  | 1 |  |  |  | — |  |  |  | — |  |  |  | 1,080 |  |  |  | 1 |
Balance as of March 31, 2012 |  |  | 3,673,615 |  |  | $ | 22,283 |  |  |  | 7,717,970 |  |  | $ | 38,613 |  |  |  | 11,391,585 |  |  | $ | 60,896 |
Stock rights offering |  |  | 3,442,026 |  |  |  | 3,593 |  |  |  | — |  |  |  | — |  |  |  | 3,442,026 |  |  |  | 3,593 |
Balance as of March 30, 2013 |  |  | 7,115,641 |  |  | $ | 25,876 |  |  |  | 7,717,970 |  |  | $ | 38,613 |  |  |  | 14,833,611 |  |  | $ | 64,489 |

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- Definition Tabular disclosure of the change in common stock outstanding. + References No definition available. + Details
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