Consolidated Condensed Statements of Comprehensive Income (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended					6 Months Ended
	Nov. 30, 2013		Aug. 31, 2013	Nov. 30, 2012		Nov. 30, 2013		Nov. 30, 2012
Net income	$ 84,862			$ 78,027		$ 162,616		$ 154,760
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments	2,040			1,675		1,394		8,692
Change in fair value of derivatives	(189)	[1]		0	[1]	(189)	[1]	(151)	[1]
Amortization of interest rate lock agreements	488	[2]		488	[2]	976	[2]	976	[2]
Change in fair value of available-for-sale securities	(4)	[3]		(10)	[3]	(18)	[3]	(12)	[3]
Other comprehensive income	2,335		(172)	2,153		2,163		9,505
Comprehensive income	$ 87,197			$ 80,180		$ 164,779		$ 164,265

[1] Net of less than $0.1 million of tax expense for the three months ended November 30, 2013. Net of less than $0.1 million of tax expense for the six months ended November 30, 2013 and 2012.

[2] Net of $0.3 million of tax benefit for the three months ended November 30, 2013 and 2012. Net of $0.6 million of tax benefit for the six months ended November 30, 2013 and 2012.

[3] Net of less than $0.1 million of tax expense and $0.1 million of tax benefit for the three months ended November 30, 2013 and 2012, respectively. Net of less than $0.1 million of tax expense and $0.1 million of tax benefit for the six months ended November 30, 2013 and 2012, respectively.