Revenue Contract Asset and Contract Liabilities balances (Details) - Short-term Contract with Customer [Member] - USD ($) $ in Thousands	6 Months Ended
	Jul. 31, 2019	Jan. 31, 2019
Capitalized Contract Cost [Line Items]
Contract with Customer, Asset, before Allowance for Credit Loss	$ 4,389	$ 2,027
Increase (Decrease) in Contract Assets	$ 2,362
Increase (decrease) in contract assets with customers, percentage	116.50%
Contract with Customer, Liability, Current	$ 1,704	$ 1,303
Increase (Decrease) in Contract Liabilities	$ 401
Increase (decrease) in contract liabilities with customers, percentage	30.80%