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Stock-Based Compensation - Stock-Based Compensation Expense (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 31, 2021	Jul. 31, 2020	Jul. 31, 2021	Jul. 31, 2020
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Total stock-based compensation expense	$ 20,402	$ 17,230	$ 35,000	$ 34,602
Unrecognized compensation cost, stock options	162,800		162,800
Stock-based compensation related to internal-use software development	300	500	1,000	800
Cost of revenue
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Total stock-based compensation expense	2,312	1,307	3,757	2,540
Sales and marketing
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Total stock-based compensation expense	7,377	7,960	12,878	15,741
Research and development
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Total stock-based compensation expense	5,828	3,933	9,816	7,876
General and administrative
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Total stock-based compensation expense	$ 4,885	$ 4,030	$ 8,549	$ 8,445
Options to purchase common stock
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Unrecognized compensation cost, period for recognition (in years)			2 years 9 months 10 days

X

- Definition

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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