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Balance Sheet Details - Depreciation and Amortization Expense (Detail) - USD ($)
$ in Millions
12 Months Ended
Apr. 29, 2016
Apr. 24, 2015
Apr. 25, 2014
Depreciation, Depletion and Amortization [Abstract]      
Depreciation and amortization expense $ 212 $ 243 $ 275