Income Taxes - Textuals (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 31, 2020	Oct. 31, 2019	Oct. 31, 2020	Oct. 31, 2019
Income Tax Disclosure [Abstract]
Income Tax Expense (Benefit)	$ 28,430	$ 35,634	$ 8,357	$ 42,454