Revenue Recognition - Textuals (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Oct. 31, 2020	Oct. 31, 2020	Jan. 31, 2020	Oct. 31, 2019
Revenue Recognition [Abstract]
Contract liability	$ 4,100	$ 4,100	$ 5,900	$ 5,400
Revenue recognized related to contract liabilities	2,100	4,300
Contract assets	$ 0	$ 0	$ 0	$ 0