Income Taxes - Components of Income Tax Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2019
Current:
Federal	$ 14,121	$ 4,885	$ 7,163
State and local	2,513	754	1,269
Foreign	756	400	463
Total current income tax expense	17,390	6,039	8,895
Deferred:
Federal	7,245	6,589	3,654
State and local	(211)	1,315	17,917
Foreign	(7)	25	94
Total deferred income tax expense	7,027	7,929	21,665
Total income tax expense	$ 24,417	$ 13,968	$ 30,560