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Stockholders' Equity - Activity Related to Restricted Stock Units Including Performance-Based Restricted Stock Units (Detail) - Restricted Stock Units
shares in Millions
9 Months Ended
Jan. 27, 2017
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Beginning balance, Number of Shares | shares 13
RSUs granted, Number of Shares | shares 5
RSUs vested, Number of Shares | shares (5)
RSUs forfeited, Number of Shares | shares (2)
Ending Balance, Number of Shares | shares 11
Beginning Balance, Weighted-Average Grant Date Fair Value | $ / shares $ 32.46
RSUs granted, Weighted-Average Grant Date Fair Value | $ / shares 24.42
RSUs vested, Weighted-Average Grant Date Fair Value | $ / shares 32.69
RSUs forfeited, Weighted-Average Grant Date Fair Value | $ / shares 32.01
Ending Balance, Weighted-Average Grant Date Fair Value | $ / shares $ 28.46