Leases - Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands		6 Months Ended
		Jul. 31, 2020	Jul. 31, 2019
Leases [Abstract]
Operating cash used for operating leases		$ 800
Operating cash used for finance leases		151
Financing cash used for finance leases		1,301	$ 1,164
Lease, Payments		2,252
Right-of-use assets recorded in exchange for lease liabilities	[1]	3,183	$ 0
Right-of-use asset obtained in exchange for finance lease liabilities		3,657
Right-of-use asset obtained in exchange for lease liabilities		$ 6,840

[1] Includes $2,741 initial right of use asset recorded upon adoption of ASC 842.