Leases - Components of Lease Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2022	Jan. 31, 2021	Jan. 31, 2020
Leases [Abstract]
Operating lease expense	$ 18,856	$ 18,533	$ 19,301
Short-term lease cost	412	601	736
Variable lease cost	10,839	9,051	9,229
Total operating lease expense	30,107	28,185	29,266
Finance lease cost:
Amortization of right-of-use assets	117	117	117
Interest on lease liabilities	$ 4	$ 9	$ 13