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Summary Financial Information (Consolidated Statements of Cash Flows ) (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2018
Operating activities:
Net cash provided by (used for) operating activities	$ 98,890	$ 106,795	$ 79,499
Investing activities:
Proceeds from sales of marketable securities	5,111	5,380	3,266
Purchases of marketable securities	(4,945)	(5,747)	(2,604)
Capital expenditures	(12,300)	(9,432)	(12,288)
Financing activities:
Proceeds from issuance of common stock	1,973	6,000	4,152
Repayment of debt	(4,450)	(51,113)	(65,088)
Other	(1,153)	(768)	(2,190)
Net cash provided by (used for) financing activities	(10,189)	(51,551)	(67,778)
Effect of exchange rate changes on cash	4,524	(1,925)	(6,429)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	$ 202,377	$ 114,700	$ 71,343	$ 63,565

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