Leases - Lease Expense (Details) $ in Thousands	6 Months Ended
	Jul. 31, 2020 USD ($)
Operating leases:
Operating lease cost	$ 822
Variable lease cost	126
Total operating lease cost	948
Finance leases:
Amortization of right-of-use assets	1,586
Interest on lease liabilities	151
Total finance lease cost	$ 1,737