Income Taxes - Components of Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2018
Current
U.S. Federal	$ (2,638)	$ 34,019	$ 89,300
State and local	18,410	26,232	20,074
Foreign	15,625	13,617	10,014
Total current	31,397	73,868	119,388
Deferred
U.S. Federal	59,856	23,258	11,356
State and local	5,578	(252)	(2,400)
Total deferred	65,434	23,006	8,956
Total	$ 96,831	$ 96,874	$ 128,344