Summary Financial Information (Consolidated Statements of Cash Flows ) (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2019
Operating activities:
Net cash provided by (used for) operating activities	$ 48,881	$ 98,890	$ 106,795
Investing activities:
Proceeds from sales of marketable securities	4,434	5,111	5,380
Purchases of marketable securities	(7,130)	(4,945)	(5,747)
Capital expenditures	(13,104)	(12,300)	(9,432)
Financing activities:
Proceeds from issuance of common stock	2,655	1,973	6,000
Repayment of debt	(477,846)	(4,450)	(51,113)
Other	(2,574)	(1,153)	(768)
Net cash provided by (used for) financing activities	420,700	(10,189)	(51,551)
Effect of exchange rate changes on cash	(2,007)	4,524	(1,925)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	$ 115,640	$ 202,377	$ 114,700	$ 71,343