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Summary Financial Information (OCI Statement) (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2019
Net income	$ 9,106	$ 59,672	$ 42,577
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments	12,583	(9,004)	(16,708)
Change in derivatives qualifying as hedges, net of tax	96	1,602	(1,037)
Adjustments [Abstract]
Total other comprehensive income (loss)	54,364	(31,298)	(22,912)
Comprehensive income	$ 63,470	$ 28,374	$ 19,665

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