Condensed Consolidated Statements Of Income (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013	Dec. 31, 2012
Revenues [Abstract]
Service revenue	$ 487,145	$ 422,068	$ 936,390	$ 816,821
Reimbursement revenue	87,091	61,069	166,910	128,836
Total revenue	574,236	483,137	1,103,300	945,657
Costs and Expenses [Abstract]
Direct costs	324,507	301,325	627,701	580,729
Reimbursable out-of-pocket expenses	87,091	61,069	166,910	128,836
Selling, general and administrative	95,528	71,909	180,440	141,937
Depreciation	16,584	15,462	32,046	30,257
Amortization of Intangible Assets	3,862	2,043	7,658	3,127
Restructuring (benefit) charges	0	(108)	0	(418)
Total costs and expenses	527,572	451,700	1,014,755	884,468
Income from operations	46,664	31,437	88,545	61,189
Interest Income (Expense), Net	(2,506)	(1,401)	(5,270)	(2,837)
Miscellaneous income (expense)	(1,201)	1,192	(1,402)	240
Total other expense	(3,707)	(209)	(6,672)	(2,597)
Income before income taxes	42,957	31,228	81,873	58,592
Provision for income taxes	14,628	9,885	27,590	22,185
Net income	$ 28,329	$ 21,343	$ 54,283	$ 36,407
Earnings per common share
Basic	$ 0.50	$ 0.36	$ 0.96	$ 0.61
Diluted	$ 0.49	$ 0.36	$ 0.95	$ 0.60
Shares used in computing earnings per common share
Basic	56,517	58,671	56,386	59,391
Diluted	57,395	59,639	57,395	60,412