Summary of Business and Significant Accounting Policies - Accounts Receivable Allowance For Credit Loss Rollforward (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2022	Jan. 31, 2021
Allowance for Doubtful Accounts Receivable [Roll Forward]
Allowance for Doubtful Accounts Receivable, Beginning Balance	$ 20,500	$ 5,150
Provision for credit losses	32,587	25,651
Write-offs	(36,087)	(10,301)
Allowance for Doubtful Accounts Receivable, Ending Balance	$ 17,000	$ 20,500