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Stockholders' Equity - Summary of Restricted Stock Unit (RSU) Activity (Detail) - Restricted Stock Units (RSUs) [Member]
6 Months Ended
Jul. 31, 2016
$ / shares
shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Unreleased Restricted Stock Units, Beginning Balance | shares 2,219,425
Unreleased Restricted Stock Units, RSUs granted | shares 1,876,140
Unreleased Restricted Stock Units, RSUs vested | shares (420,845)
Unreleased Restricted Stock Units, RSUs forfeited/cancelled | shares (202,939)
Unreleased Restricted Stock Units, Ending Balance | shares 3,471,781
Weighted average grant date fair value, Beginning Balance | $ / shares $ 26.80
Weighted average grant date fair value, RSUs granted | $ / shares 26.85
Weighted average grant date fair value, RSUs vested | $ / shares 26.57
Weighted average grant date fair value, RSUs forfeited/cancelled | $ / shares 26.23
Weighted average grant date fair value, Ending Balance | $ / shares $ 26.89