Leases - Supplemental Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2020	Jan. 31, 2019	Jan. 31, 2018
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from finance lease	$ 1,817
Operating cash flows from operating leases	4,450
Financing cash flows from finance lease	1,915	$ 0	$ 0
Right-of-use assets obtained in exchange for lease obligations:
Finance lease	0
Operating leases	$ 3,930
Weighted-average remaining lease term (in years):
Finance lease	9 years 10 months 24 days
Operating leases	4 years 2 months 12 days
Weighted-average discount rate:
Finance lease	5.60%
Operating leases	6.20%