Consolidated Condensed Statements of Comprehensive Income (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended				9 Months Ended
	Feb. 28, 2013		Feb. 29, 2012		Feb. 28, 2013		Feb. 29, 2012
Net income	$ 74,705		$ 76,035		$ 229,465		$ 219,023
Other comprehensive (loss) income, net of tax:
Foreign currency translation adjustments	(8,173)		11,203		519		(9,343)
Change in fair value of derivatives	(36)	[1]	304	[1]	(187)	[1]	485	[1]
Amortization of interest rate lock agreements	488		377		1,464		1,131
Change in fair value of available-for-sale securities	1	[2]	(29)	[2]	(11)	[2]	(4)	[2]
Other comprehensive (loss) income	(7,720)		11,855		1,785		(7,731)
Comprehensive income	$ 66,985		$ 87,890		$ 231,250		$ 211,292

[1] Net of $0.2 million of tax benefit for the three months ended February 29, 2012. Net of less than $0.1 million of tax expense and $0.3 million of tax benefit for the nine months ended February 28, 2013 and February 29, 2012, respectively.

[2] Net of less than $0.1 million of tax benefit and $0.1 million of tax expense for the three months ended February 28, 2013 and February 29, 2012, respectively. Net of less than $0.1 million of tax benefit and $0.1 million of tax expense for the nine months ended February 28, 2013 and February 29, 2012, respectively.