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Stockholders' Equity - Summary of RSU Activity (Detail) - Restricted Stock Units (RSUs) [Member]
12 Months Ended
Jan. 31, 2016
$ / shares
shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Unreleased Restricted Stock Units, Beginning Balance | shares 965,972
Unreleased Restricted Stock Units, RSUs granted | shares 1,996,000
Unreleased Restricted Stock Units, RSUs vested | shares (446,515)
Unreleased Restricted Stock Units, RSUs forfeited/cancelled | shares (296,032)
Unreleased Restricted Stock Units, Ending Balance | shares 2,219,425
Weighted average grant date fair value, Beginning Balance | $ / shares $ 27.48
Weighted average grant date fair value, RSUs granted | $ / shares 26.59
Weighted average grant date fair value, RSUs vested | $ / shares 27.28
Weighted average grant date fair value, RSUs forfeited/cancelled | $ / shares 26.88
Weighted average grant date fair value, Ending Balance | $ / shares $ 26.80