Unaudited Quarterly Financial Data (Details) (USD $)	3 Months Ended								12 Months Ended
	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Sep. 30, 2010	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2010
Quarterly Financial Data [Abstract]
Revenue	$ 826,159,000	$ 901,516,000	$ 879,710,000	$ 810,351,000	$ 851,265,000	$ 866,081,000	$ 790,664,000	$ 751,441,000	$ 3,417,736,000	$ 3,259,451,000	$ 2,387,829,000
Income from operations	96,890,000	108,883,000	99,134,000	95,009,000	89,647,000	102,273,000	62,053,000	59,190,000	399,916,000	313,163,000	164,445,000
Income before income taxes	97,867,000	110,245,000	102,333,000	95,787,000	88,258,000	108,126,000	71,398,000	58,859,000	406,232,000	326,641,000	169,917,000
Net income attributable to controlling interests	$ 65,336,000	$ 68,234,000	$ 66,939,000	$ 59,704,000	$ 43,856,000	$ 69,236,000	$ 48,103,000	$ 33,242,000	$ 260,213,000	$ 194,437,000	$ 120,597,000
Earnings Per Share [Abstract]
Net income, basic	$ 0.91	$ 0.95	$ 0.92	$ 0.82	$ 0.59	$ 0.94	$ 0.65	$ 0.45	$ 3.60	$ 2.62	$ 2.04
Net income, diluted	$ 0.91	$ 0.95	$ 0.92	$ 0.82	$ 0.59	$ 0.94	$ 0.65	$ 0.45	$ 3.59	$ 2.62	$ 2.03