Selected Quarterly Financial Data (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2020
Revenue from Contract with Customer, Excluding Assessed Tax	$ 906,555	$ 649,642	$ 809,162
Net income per share - diluted (in dollars per share)	$ 1.04	$ 0.38	$ 2.50
Earnings Per Share, Basic	$ 1.06	$ 0.38	$ 2.53
Operating Income (Loss)	$ 73,781	$ 42,255	$ 89,824
Gross Profit	$ 315,730	$ 220,225	$ 283,186