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Purchased Intangible Assets, Net - Future Amortization Expense Related to Purchased Intangible Assets (Detail) (USD $)
In Millions, unless otherwise specified
Jul. 25, 2014
Apr. 25, 2014
Acquired Finite-Lived Intangible Assets [Line Items]    
Remainder of 2015 $ 43.4  
2016 53.6  
2017 6.7  
2018 3.3  
Net Assets $ 107.0 $ 121.5