Revenue Contract Asset and Contract Liabilities balances (Details) - Short-term Contract with Customer [Member] - USD ($) $ in Thousands	6 Months Ended
	Jul. 31, 2020	Jan. 31, 2020
Capitalized Contract Cost [Line Items]
Contract Assets	$ 4,826	$ 7,525
Change Contract Assets	$ (2,699)
Increase (decrease) in contract assets with customers, percentage	(35.90%)
Contract Liabilities	$ 3,013	$ 2,288
Change in contract liabilities	$ 725
Increase (decrease) in contract liabilities with customers, percentage	31.70%