CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Net income	$ 25,924	$ 27,521	$ 49,487	$ 54,252
Other comprehensive income, net of tax:
Change in net unrealized gain (loss) on cash flow hedges	(1,697)	2,768	(1,195)	4,033
Change in net foreign currency translation adjustments	217	(1,059)	(119)	(407)
Change in net unrealized gain (loss) on investments	46	(220)	58	(167)
Other comprehensive income (loss)	(1,434)	1,489	(1,256)	3,459
Comprehensive income	$ 24,490	$ 29,010	$ 48,231	$ 57,711