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Employees' Retirement and Defined Contribution Plans - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
May 03, 2014
Apr. 27, 2013
Apr. 28, 2012
Pension and Other Postretirement Benefit Plans [Line Items]      
Pension expense $ 2,465 $ 2,836 $ 1,970
Company contributions, employee benefit expenses 16,744 15,902 15,273
Company contributions for postretirement plan $ 44 $ 0 $ 150