Income Taxes - Textuals (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 31, 2020	Jul. 31, 2019	Jul. 31, 2020	Jul. 31, 2019
Income Tax Disclosure [Abstract]
Income Tax Expense (Benefit)	$ (3,660)	$ 4,270	$ (20,073)	$ 6,820