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Stockholders' Equity - Summary of Activities Related to Stock Repurchase Program (Detail) (USD $)
In Millions, except Per Share data, unless otherwise specified
9 Months Ended
Jan. 23, 2015
Equity [Abstract]  
Number of shares repurchased 23.1us-gaap_StockRepurchasedAndRetiredDuringPeriodShares
Average price per share $ 39.73us-gaap_TreasuryStockAcquiredAverageCostPerShare
Aggregate purchase price $ 918.9us-gaap_StockRepurchasedAndRetiredDuringPeriodValue
Remaining authorization at end of period $ 205.9us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1