Leases - Lease Maturities (Details) - USD ($) $ in Thousands	Apr. 30, 2020	Jan. 31, 2020
Finance Lease, Liability, Payment, Due [Abstract]
Remainder of 2021	$ 6,055
2022	8,073
2023	8,073
2024	8,073
2025	8,445
Thereafter	42,829
Total minimum payments	81,548
Less imputed interest	(18,793)
Present value of future minimum lease payments	62,755
Less current obligations under leases	(4,698)	$ (4,633)
Non-current lease obligations	58,057	59,257
Lessee, Operating Lease, Liability, Payment, Due [Abstract]
Remainder of 2021	3,625
2022	5,524
2023	5,557
2024	4,512
2025	4,125
Thereafter	18,180
Total minimum payments	41,523
Less imputed interest	(7,893)
Present value of future minimum lease payments	33,630
Less current obligations under leases	(4,005)	(3,750)
Non-current lease obligations	$ 29,625	$ 8,113