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Stockholders' Equity - Additional Information (Detail)	12 Months Ended
Stockholders' Equity - Additional Information (Detail)	Jan. 31, 2020 USD ($) vote $ / shares shares	Jan. 31, 2019 $ / shares shares	Jan. 31, 2018 $ / shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock option award	13,448,026	12,961,397
Board of directors service term	3 years
Dividends declared \| $	$ 0
Dividends paid \| $	$ 0
Weighted-average grant date fair value of options granted \| $ / shares	$ 60.05	$ 35.43	$ 30.87
Unrecognized compensation cost related to unvested stock options granted \| $	$ 194,500,000
Closing stock price \| $ / shares	$ 146.61
Intrinsic value of options exercised \| $	$ 229,000,000.0
Stock options, granted	2,502,908
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	4 years
Weighted average period of unvested stock	3 years 10 months 24 days
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	2 years 9 months 18 days
RSUs granted (in usd per share) \| $ / shares	$ 142.92
Unrecognized compensation cost related to unvested RSUs \| $	$ 157,400,000
Total intrinsic value, vested \| $	$ 178,800,000
Restricted Stock Units (RSUs) \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	4 years
CEO
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options, granted	2,838,635
2007 Stock Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock option award	0
2012 Equity Incentive Award Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock option award	0
2013 Equity Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock option award	0
Minimum incremental of issuance of common stock	13,750,000
Common shares outstanding percentage	5.00%
2013 Equity Incentive Plan \| Stock Options \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	9 years
Stock option exercisable period	10 years
2013 Equity Incentive Plan \| Stock Options \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	5 years
2013 Equity Incentive Plan \| Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
RSUs granted (in usd per share) \| $ / shares	$ 142.92
2013 Equity Incentive Plan \| Restricted Stock Units (RSUs) \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	5 years
2013 Equity Incentive Plan \| Restricted Stock Units (RSUs) \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	1 year
2013 Equity Incentive Plan \| Board of Directors
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Incremental of issuance of common stock	6,578,553
2013 Employee Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Minimum incremental of issuance of common stock	2,200,000
Common shares outstanding percentage	1.00%
Common stock reserve for future issuance	4,000,000.0
Number of shares available for issuance	4,897,856
Common stock acquire at fair market value	85.00%
Common stock purchases through payroll deductions	15.00%
2007 Stock Plans \| Stock Options \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	5 years
Stock option exercisable period	10 years
2007 Stock Plans \| Stock Options \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	4 years
2012 Stock Plan \| Stock Options \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	9 years
Stock option exercisable period	10 years
2012 Stock Plan \| Stock Options \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	5 years
Class A common stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock, shares outstanding	133,892,725	125,980,019
Vote per common share \| vote	1
Conversion of common stock outstanding	100.00%
Conversion of common stock	100.00%
Class A common stock \| 2013 Equity Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock available for issuance	28,471,030
Class B common stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock, shares outstanding	15,202,858	20,210,060
Vote per common share \| vote	10