Income Tax (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 31, 2020	Oct. 31, 2019	Oct. 31, 2020	Oct. 31, 2019
Income Tax Contingency [Line Items]
Effective tax rate, percent	1.60%	13.00%	1.90%	14.70%
Total Discrete tax benefit (expense), net	$ 303	$ 268	$ 580	$ 1,336