Revenue Changes in Contract Assets and Liabilities (Details) - Short-term Contract with Customer [Member] - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2020	Jan. 31, 2019
Capitalized Contract Cost [Line Items]
Contract assets	$ 7,525	$ 2,027
Contract asset $ change	$ 5,498
Contract asset % change	271.20%
Contract liabilities	$ 2,288	$ 1,303
Contract liability $ change	$ 985
Contract liability % change	75.60%