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Post-Retirement Plans - Additional Information (Detail) (USD $)
4 Months Ended
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