CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) (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	$ 28,206	$ 30,898	$ 77,693	$ 85,150
Other comprehensive income, net of tax:
Change in net unrealized gain (loss) on cash flow hedges	(1,605)	2,078	(2,800)	6,112
Change in net foreign currency translation adjustments	61	(535)	(58)	(942)
Change in net unrealized gain (loss) on investments	(33)	56	25	(112)
Other comprehensive income (loss)	(1,577)	1,599	(2,833)	5,058
Comprehensive income	$ 26,629	$ 32,497	$ 74,860	$ 90,208