Consolidated Condensed Statements of Comprehensive Income (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Aug. 31, 2012		Aug. 31, 2011
Net income	$ 76,733		$ 68,638
Other Comprehensive Income (Loss), Net of Tax:
Foreign currency translation adjustments	7,017		218
Change in fair value of derivatives	(151)	[1]	153	[1]
Amortization of interest rate lock agreements	488		377
Change in fair value of available-for-sale securities	(2)	[1]	18	[1]
Other comprehensive income	7,352		766
Comprehensive income	$ 84,085		$ 69,404

[1] Net of less than $0.1 million of tax expense and less than $0.1 million of tax benefit for the three months ended August 31, 2012 and 2011, respectively.