Schedule II: Valuation and Qualifying Accounts (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2021	Jan. 31, 2020	Jan. 31, 2019
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Current Fiscal Year End Date	--01-31
Accounts receivable allowances
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Year	$ 7,634	$ 2,071	$ 560
Additions	47,405	8,583	3,763
Write-offs or Deductions	(18,195)	(3,020)	(2,252)
Balance at End of Year	36,844	7,634	2,071
Deferred tax asset valuation allowance
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Year	36,353	877	3,154
Additions	298,698	35,476	0
Write-offs or Deductions	0	0	(2,277)
Balance at End of Year	$ 335,051	$ 36,353	$ 877