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Post-Retirement Plans - Additional Information (Detail) (USD $) | 4 Months Ended
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Apr. 20, 2013 | Apr. 21, 2012
Pension and Other Postretirement Benefits Disclosure [Line Items] |  |
Cash Contributions to pension plans | $ 484,000 | $ 12,055,000
Expected pension income for fiscal 2013 | 15,200,000 |
Total cost and employer contributions | $ 7,500,000 | $ 6,500,000

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