Income Tax (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 31, 2020	Jul. 31, 2019	Jul. 31, 2020	Jul. 31, 2019
Income Tax Contingency [Line Items]
Effective tax rate, percent	10.80%	20.00%	2.20%	15.50%
Total Discrete tax benefit (expense), net	$ (54)	$ 22	$ 277	$ 1,190