Balance Sheet Components - Rollforward of Allowance For Credit Losses (Details) - USD ($) $ in Thousands	9 Months Ended
	Oct. 31, 2021	Oct. 31, 2020
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	$ 20,500	$ 5,150
Provision for credit losses	19,416	17,070
Write-offs	(18,816)	(5,720)
Ending balance	$ 21,100	$ 16,500