Deferred Revenue, Performance Obligations, and Unbilled Accounts Receivable - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 31, 2021	Oct. 31, 2020	Oct. 31, 2021	Oct. 31, 2020	Jan. 31, 2021
Revenue From Contracts With Customers [Line Items]
Unbilled accounts receivable	$ 67,970		$ 67,970		$ 47,206
Subscription services
Revenue From Contracts With Customers [Line Items]
Recognition of deferred revenue	296,000	$ 232,000	535,000	$ 409,000
Revenue expected to be recognized from remaining performance obligations	1,037,000		1,037,000
Unbilled accounts receivable	38,000		38,000		27,000
Professional services and other
Revenue From Contracts With Customers [Line Items]
Unbilled accounts receivable	$ 30,000		$ 30,000		$ 20,000