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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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

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Number of shares issued under share-based payment arrangement.

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Price of a single share of a number of saleable stocks of a company.

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Intrinsic value of vested award under share-based payment arrangement. Excludes share and unit options.

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Common stock shares outstanding percentage.

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Percentage of common stock acquire to fair market value.

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Percentage of payroll deductions for shares acquire.

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Share based compensation arrangement by share based payment awards award exercisable period.

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Vote Per Common Share

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Stockholders' Equity - Additional Information (Detail)	12 Months Ended
Stockholders' Equity - Additional Information (Detail)	Jan. 31, 2021 USD ($) vote $ / shares shares	Jan. 31, 2020 $ / shares shares	Jan. 31, 2019 $ / shares	Jan. 29, 2021 $ / shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Dividends payable \| $	$ 0
Options outstanding (in shares)	12,761,289	13,448,026
Unrecognized compensation cost related to unvested stock options granted \| $	$ 215,000,000
Share price (in usd per share) \| $ / shares				$ 276.44
Intrinsic value of options exercised \| $	$ 376,000,000
Class A common stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock, shares issued (in shares)	137,062,817	133,892,725
Common stock, shares outstanding (in shares)	137,062,817	133,892,725
Vote per common share \| vote	1
Class B common stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock, shares issued (in shares)	14,993,991	15,202,858
Common stock, shares outstanding (in shares)	14,993,991	15,202,858
Vote per common share \| vote	10
2007 Stock Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options outstanding (in shares)	0
2021 Equity Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options outstanding (in shares)	0
2013 Equity Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options outstanding (in shares)	0
Number of additional shares authorized (in shares)	13,750,000
Common stock, shares outstanding, percentage	5.00%
Weighted-average grant date fair value of options granted (in usd per share) \| $ / shares	$ 71.86	$ 60.05	$ 35.43
2013 Equity Incentive Plan \| Director
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares issued in period (in shares)	6,709,301
2013 Equity Incentive Plan \| Class A common stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares available for issuance (in shares)	33,692,818
2013 Employee Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of additional shares authorized (in shares)	2,200,000
Common stock, shares outstanding, percentage	1.00%
Number of shares reserved for future issuance (in shares)	4,000,000
Number of shares authorized (in shares)	4,897,856
Percent of fair market value paid for shares	85.00%
Percentage of payroll deductions for shares acquired	15.00%
2013 Employee Stock Purchase Plan \| Director
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares issued in period (in shares)	0
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	1 year
Weighted average period of unvested stock (in years)	2 years 4 months 24 days
Unrecognized compensation cost related to unvested RSUs \| $	$ 109,000,000
Total intrinsic value, vested \| $	$ 261,000,000
Restricted Stock Units (RSUs) \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	4 years
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	4 years
Weighted average period of unvested stock (in years)	3 years 2 months 12 days
Stock Options \| 2007 Stock Plan \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	4 years
Stock Options \| 2007 Stock Plan \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	5 years
Options exercisable period	10 years
Stock Options \| 2013 Equity Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	4 years
Stock Options \| 2013 Equity Incentive Plan \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	5 years
Stock Options \| 2013 Equity Incentive Plan \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	9 years
Options exercisable period	10 years