Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 31, 2021	Jul. 31, 2020	Jul. 31, 2021	Jul. 31, 2020
Income Tax Disclosure [Abstract]
Income tax expense	$ 2,506	$ 376	$ 4,309	$ 1,788
Income tax audit reserve	400		400
Reserve related to several open fiscal years not under audit	$ 700		$ 700