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Stock-Based Compensation - Employee Stock Purchase Plan (Details) - USD ($) $ / shares in Units, $ in Thousands		12 Months Ended			47 Months Ended
	Sep. 15, 2021	Jan. 31, 2022	Jan. 31, 2021	Jan. 31, 2020	Mar. 15, 2021	Feb. 01, 2021	Mar. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Issuance of common stock under employee stock purchase plan		$ 6,485	$ 7,000	$ 6,627
Stock-based compensation expense		$ 73,480	72,294	67,770
Shares estimated to be purchased under ESPP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized, annual increase (in shares)						1,239,891	2,500,000
Number of shares authorized, annual increase, percentage of outstanding shares at the end of prior fiscal year							1.00%
Number of shares authorized (in shares)		3,543,696
Issuance of common stock under employee stock purchase plan (in shares)	248,633				282,119
Shares purchased under plan (in dollars per share)	$ 10.73				$ 13.53
Issuance of common stock under employee stock purchase plan	$ 2,700				$ 3,800
Number of shares purchased under plan (in shares)		291,079
Common stock withheld on behalf of employees for future purchases under the ESPP (in shares)		2,400,000
Stock-based compensation expense		$ 2,200	$ 2,800	$ 2,700
Unrecognized compensation cost		$ 300
Unrecognized compensation cost, period for recognition (in years)		1 month 13 days
Maximum payroll deduction (as a percent of eligible compensation)		15.00%
Purchase price of common stock (as a percent)		85.00%

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