Income Taxes - Effective Income Tax Rate (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Income tax expense	$ 55,010	$ 48,293	$ 64,169	$ 55,052
Effective income tax rate	21.40%	19.70%	19.80%	18.60%