CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Jun. 30, 2012	Jun. 30, 2011
Net income	$ 23,563	$ 26,731
Other comprehensive income, net of tax:
Change in net unrealized (loss) gain on cash flow hedges	(336)	1,265
Change in net foreign currency translation adjustments	502	652
Change in net unrealized gain on investments	12	53
Other comprehensive income	178	1,970
Comprehensive income	$ 23,741	$ 28,701