Schedule II: Valuation and Qualifying Accounts (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2020	Jan. 31, 2019	Jan. 31, 2018
Accounts receivable allowances
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Year	$ 2,071	$ 560	$ 922
Additions	8,583	3,763	1,284
Write-offs or Deductions	(3,020)	(2,252)	(1,646)
Balance at End of Year	7,634	2,071	560
Deferred tax asset valuation allowance
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Year	877	3,154	6,220
Additions	35,476	0	0
Write-offs or Deductions	0	(2,277)	(3,066)
Balance at End of Year	$ 36,353	$ 877	$ 3,154