Income Taxes - Effective Income Tax Rate (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2020	Dec. 31, 2019
Income Tax Disclosure [Abstract]
Income tax expense	$ 73,020	$ 55,010	$ 99,331	$ 64,169
Effective income tax rate	22.20%	21.40%	22.10%	19.80%