Revenue Contract Asset and Contract Liabilities balances (Details) - Short-term Contract with Customer [Member] - USD ($) $ in Thousands	9 Months Ended
	Oct. 31, 2020	Jan. 31, 2020
Capitalized Contract Cost [Line Items]
Contract Assets	$ 3,778	$ 7,525
Change Contract Assets	$ (3,747)
Increase (decrease) in contract assets with customers, percentage	(49.80%)
Contract Liabilities		$ 2,288
Change in contract liabilities	$ 653
Increase (decrease) in contract liabilities with customers, percentage	28.50%