Income Taxes - Effective Income Tax Rate (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Income Tax Disclosure [Abstract]
Income tax expense	$ 26,410	$ 19,413	$ 26,311	$ 9,159
Effective income tax rate	20.60%	20.00%	21.90%	13.50%