Leases - Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands		9 Months Ended
		Oct. 31, 2020	Oct. 31, 2019
Leases [Abstract]
Operating cash used for operating leases		$ 1,234
Operating cash used for finance leases		236
Financing cash used for finance leases		1,797	$ 1,624
Total		3,267
Right-of-use assets recorded in exchange for lease liabilities	[1]	4,420	$ 0
Right-of-use asset obtained in exchange for finance lease liabilities		6,050
Right-of-use asset obtained in exchange for lease liabilities		$ 10,470

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