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Goodwill and Purchased Intangible Assets, Net - Schedule of Goodwill Activity (Detail) (USD $)
In Millions, unless otherwise specified
9 Months Ended
Jan. 23, 2015
Goodwill And Intangible Assets Disclosure [Abstract]  
Beginning balance $ 988.1us-gaap_Goodwill
Goodwill acquired 43.2us-gaap_GoodwillAcquiredDuringPeriod
Ending balance $ 1,031.3us-gaap_Goodwill