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Stockholders' Equity - Activity Related to Restricted Stock Units Including Performance-Based Restricted Stock Units (Detail) - 3 months ended Jul. 31, 2015 - Restricted Stock Units - $ / shares
shares in Millions
Total
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Beginning balance, Number of Shares 13
RSUs granted, Number of Shares 5
RSUs vested, Number of Shares (3)
RSUs forfeited, Number of Shares (1)
Ending Balance, Number of Shares 14
Beginning Balance, Weighted-Average Grant Date Fair Value $ 36.58
RSUs granted, Weighted-Average Grant Date Fair Value 31.38
RSUs vested, Weighted-Average Grant Date Fair Value 37.48
RSUs forfeited, Weighted-Average Grant Date Fair Value 35.95
Ending Balance, Weighted-Average Grant Date Fair Value $ 34.54