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Goodwill and Purchased Intangible Assets, Net - Future Amortization Expense Related to Purchased Intangible Assets (Detail) (USD $)
In Millions, unless otherwise specified
Apr. 24, 2015
Apr. 25, 2014
Goodwill And Intangible Assets Disclosure [Abstract]    
2016 $ 58.4us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths  
2017 13.9us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo  
2018 9.4us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree  
2019 5.2us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour  
2020 2.6us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive  
Net Assets $ 89.5us-gaap_FiniteLivedIntangibleAssetsNet $ 121.5us-gaap_FiniteLivedIntangibleAssetsNet