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Selected Quarterly Financial Data (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2019
Revenue from Contract with Customer, Excluding Assessed Tax	$ 649,642	$ 809,162	$ 876,282
Net income per share - diluted (in dollars per share)	$ 0.38	$ 2.50	$ 1.80
Earnings Per Share, Basic	$ 0.38	$ 2.53	$ 1.83
Operating Income (Loss)	$ 42,255	$ 89,824	$ 69,442
Gross Profit	$ 220,225	$ 283,186	$ 304,997

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