Revenue Changes in Contract Assets and Liabilities (Details) - Short-term Contract with Customer [Member] - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2021	Jan. 31, 2020
Capitalized Contract Cost [Line Items]
Contract assets	$ 3,256	$ 7,525
Contract asset $ change	$ (4,269)
Contract asset % change	(56.70%)
Contract liabilities	$ 2,998	$ 2,288
Contract liability $ change	$ 710
Contract liability % change	31.00%