Consolidated Statements of Comprehensive (Loss) Income (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Statement Of Income And Comprehensive Income [Abstract]
Net income (loss)	$ 8,252	$ 6,676	$ 16,688	$ 9,455
Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent [Abstract]
Foreign currency translation adjustments	2,466	(6,579)	2,644	(4,450)
Change in derivatives qualifying as hedges, net of deferred tax expense of $(3), $17, $(3), and $154	(91)	65	188	72
Unrealized holding gain (loss) arising during the period, net of deferred taxes of $0 for all periods	521	(655)	(401)	(412)
Reclassification adjustment for gain included in net income, net of deferred tax expense of $0 for all periods	(170)	68	(253)	125
Total Adjustments	351	(587)	148	(287)
Total other comprehensive (loss) income	2,726	(7,101)	2,684	(4,665)
Comprehensive Income Net Of Tax	$ 10,978	$ (425)	$ (14,004)	$ 4,790