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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

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Amount by which current fair value of underlying stock exceeds exercise price of fully vested and expected to vest options outstanding. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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