Consolidated Balance Sheets (USD $)	Jun. 30, 2012	Jun. 30, 2011
Assets
Cash and cash equivalents	$ 478,179,000	$ 528,923,000
Restricted cash	171,406,000	153,154,000
Short-term investments	40,436,000	43,682,000
Receivables from clients:
Billed, net of allowances of $20,871 and $12,636	564,111,000	502,910,000
Unbilled, at estimated net realizable value	320,240,000	276,020,000
Total billed and unbilled receivables	884,351,000	778,930,000
Other current assets	185,025,000	145,862,000
Total current assets	1,759,397,000	1,650,551,000
Fixed assets, net	315,000,000	252,343,000
Deferred income taxes	157,491,000	188,569,000
Goodwill	2,252,555,000	1,943,574,000
Intangible assets, net	768,848,000	694,922,000
Other assets	103,687,000	368,991,000
Total Assets	5,356,978,000	5,098,950,000
Liabilities
Accounts payable, accrued liabilities and deferred income	333,443,000	285,793,000
Employee-related liabilities	558,222,000	573,214,000
Fiduciary liabilities	171,406,000	147,902,000
Notes payable	0	99,341,000
Other current liabilities	39,911,000	71,944,000
Total current liabilities	1,102,982,000	1,178,194,000
Revolving credit facility	208,000,000	0
Term loan	250,000,000	0
Accrued retirement benefits and other employee-related liabilities	880,877,000	811,779,000
Professional liability claims reserve	266,619,000	312,258,000
Other noncurrent liabilities	191,183,000	194,049,000
Total Liabilities	2,899,661,000	2,496,280,000
Commitments and contingencies
Statement [Line Items]
Common Stock value	745,000	746,000
Additional paid-in capital	1,833,799,000	1,773,285,000
Treasury stock, at cost - 2,855,180 and 948,341 shares	(168,901,000)	(52,360,000)
Retained earnings	1,117,622,000	883,161,000
Accumulated other comprehensive loss	(350,745,000)	(13,305,000)
Total Stockholders' Equity	2,432,520,000	2,591,527,000
Non-controlling interest	24,797,000	11,143,000
Total Equity	2,457,317,000	2,602,670,000
Total Liabilities and Total Equity	5,356,978,000	5,098,950,000
Class A Common Stock - $0.01 par value: 300,000,000 shares authorized; 63,521,654 and 57,897,889 issued and 60,666,475 and 56,949,548 outstanding[Member]
Statement [Line Items]
Common Stock value	635,000	579,000
Class B Common Stock - $0.01 par value: 93,500,000 shares authorized; 11,035,878 and 16,651,890 issued and 11,035,878 and 16,651,890 outstanding [Member]
Statement [Line Items]
Common Stock value	$ 110,000	$ 167,000