Consolidated Statements of Comprehensive Income (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2012	Dec. 31, 2011
Net income	$ 11,138	$ 10,031	$ 26,056	$ 19,481
Other comprehensive income:
Unrealized (loss) gain on cash equivalents, marketable securities and restricted investment, net of taxes (benefits) of $0, $0, ($73) and ($58)	(24)	17	97	154
Unrealized gain (loss) on hedge contracts, net of (benefits) taxes of ($23), ($39), $88 and ($241)	(38)	(68)	138	(393)
Cumulative translation adjustments	719	(936)	1,003	(936)
Other comprehensive income	657	(987)	1,238	(1,175)
Comprehensive income	$ 11,795	$ 9,044	$ 27,294	$ 18,306