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Balance Sheet Details - Product Warranty Liabilities (Detail) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Jan. 27, 2017
Jan. 29, 2016
Jan. 27, 2017
Jan. 29, 2016
Jan. 27, 2017
Apr. 29, 2016
Movement In Standard Product Warranty Accrual [Roll Forward]            
Balance at beginning of period $ 54 $ 80 $ 70 $ 86    
Expense accrued during the period 4 5 9 27    
Warranty costs incurred (8) (12) (29) (40)    
Balance at end of period 50 73 50 73    
Standard Product Warranty Accrual, Balance Sheet Classification [Abstract]            
Accrued expenses         $ 34 $ 48
Other long-term liabilities         16 22
Total warranty liabilities $ 54 $ 80 $ 70 $ 86 $ 50 $ 70