Summary Financial Information (OCI Statement) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2015		Mar. 31, 2014		Mar. 31, 2013
Net income	$ 27,190		$ 30,421		$ 78,296
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments	(29,907)		3,067		(2,183)
Change in derivatives qualifying as hedges, net of tax	(334)		254		(388)
Change in investments:
Unrealized holdings gain arising during the period	433	[1]	395	[1]	725	[1]
Reclassification adjustment for gain included in net income, net of tax	(1,342)	[1]	(1,435)	[1]	(497)	[1]
Net change in unrealized gain (loss) on investments	(909)		(1,040)		228
Total other comprehensive income (loss)	(51,312)		15,019		(2,248)
Comprehensive income (loss)	$ (24,122)		$ 45,440		$ 76,048

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