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Common Stock and Stockholders' Equity (Stock Options) (Detail)
$ / shares in Units, $ in Millions
12 Months Ended
Jan. 31, 2019
USD ($)
$ / shares
shares
Outstanding Stock Options  
Beginning Balance (in shares) | shares 6,595,486
Stock option grants (in shares) | shares 1,103,942
Stock options exercised (in shares) | shares (1,872,545)
Stock options canceled (in shares) | shares (46,141)
Ending Balance (in shares) | shares 5,780,742
Vested and expected to vest ( in shares) | shares 5,706,507
Exercisable (in shares) | shares 4,985,686
Weighted- Average Exercise Price  
Beginning Balance (in usd per share) | $ / shares $ 4.23
Stock option grants (in usd per share) | $ / shares 26.84
Stock options exercised (in usd per share) | $ / shares 5.68
Stock options canceled (in usd per share) | $ / shares 18.77
Ending Balance (in usd per share) | $ / shares 7.96
Vested and expected to vest, Weighted-Average Exercise Price (in usd per share) | $ / shares 7.66
Exercisable, Weighted-Average Exercise Price (in usd per share) | $ / shares $ 4.74
Beginning Balance, Aggregate Intrinsic Value | $ $ 763
Ending Balance, Aggregate Intrinsic Value | $ 1,003
Vested and expected to vest, Aggregate Intrinsic Value | $ 992
Exercisable, Aggregate Intrinsic Value | $ $ 881