Leases - Components of Lease Expense (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 31, 2021	Oct. 31, 2020	Oct. 31, 2021	Oct. 31, 2020
Finance lease cost:
Amortization of finance lease right-of-use assets	$ 993	$ 993	$ 2,981	$ 2,981
Interest on finance lease liabilities	785	852	2,406	2,604
Operating lease cost	2,313	2,335	6,481	6,189
Short-term lease cost	431	435	630	1,968
Total lease cost	$ 4,522	$ 4,615	$ 12,498	$ 13,742