Condensed Consolidated Statements of Comprehensive Income (USD $) In Thousands	3 Months Ended
Jun. 30, 2011	Jun. 30, 2010
Comprehensive income (loss) (pretax):
Net earnings	$ 125,730	$ 106,645
Comprehensive income (loss) (tax effect):
Net earnings	(47,507)	(40,143)
Comprehensive income (loss) (net of tax):
Net earnings	78,223	66,502
Other comprehensive income (loss):
Foreign currency translation (pretax)	992	(3,876)
Foreign currency translation (tax effect)	0	0
Foreign currency translation (net of tax)	992	(3,876)
Unrealized gain (loss) on investments (pretax)	(5,378)	1,188
Unrealized gain (loss) on investments (tax effect)	2,001	(322)
Unrealized gain (loss) on investments (net of tax)	(3,377)	866
Change in fair value of cash flow hedges (pretax)	(3,860)	(12,083)
Change in fair value of cash flow hedges (tax effect)	1,467	4,592
Change in fair value of cash flow hedges (net of tax)	(2,393)	(7,491)
Total comprehensive income (loss) (pretax)	117,484	91,874
Total comprehensive income (loss) (tax effect)	(44,039)	(35,873)
Total comprehensive income (loss) (net of tax)	$ 73,445	$ 56,001

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