Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 31, 2021	Oct. 31, 2020	Oct. 31, 2021	Oct. 31, 2020
Income Tax Disclosure [Abstract]
Income tax expense	$ 1,823	$ 1,100	$ 6,132	$ 2,888
Reserve related to several open fiscal years not under audit	$ 1,300		$ 1,300