Summary Financial Information (OCI Statement) (Details) - USD ($) $ in Thousands		12 Months Ended
		Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015
Net income		$ 8,984	$ 19,579	$ 27,190
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments		(9,379)	3,650	(29,907)
Change in derivatives qualifying as hedges, net of tax		(3,514)	(1,031)	(334)
Change in investments:
Unrealized holdings gain arising during the period	[1]	173	(79)	433
Reclassification adjustment for gain included in net income, net of tax	[1]	(105)	(154)	(1,342)
Net change in unrealized gain (loss) on investments		68	(233)	(909)
Total other comprehensive income (loss)		(2,717)	(2,299)	(51,312)
Comprehensive income (loss)		$ 6,267	$ 17,280	$ (24,122)

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