Condensed Consolidated Statements Of Income (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2015	Mar. 31, 2014
Revenues [Abstract]
Service revenue	$ 502,033	$ 492,375	$ 1,492,998	$ 1,428,765
Reimbursement revenue	74,382	85,543	232,151	252,453
Total revenue	576,415	577,918	1,725,149	1,681,218
Costs and Expenses [Abstract]
Direct costs	337,954	323,149	984,094	950,850
Reimbursable out-of-pocket expenses	74,382	85,543	232,151	252,453
Selling, general and administrative	88,427	96,528	286,135	276,968
Depreciation	17,934	16,802	51,644	48,848
Amortization of Intangible Assets	3,489	3,725	10,532	11,383
Total costs and expenses	522,186	525,747	1,564,556	1,540,502
Income from operations	54,229	52,171	160,593	140,716
Interest Income (Expense), Net	(1,820)	(2,072)	(5,392)	(7,342)
Miscellaneous income (expense)	1,314	(292)	7,594	(1,694)
Total other expense	(506)	(2,364)	2,202	(9,036)
Income before income taxes	53,723	49,807	162,795	131,680
Provision for income taxes	15,982	15,068	49,152	42,658
Net income	$ 37,741	$ 34,739	$ 113,643	$ 89,022
Earnings per common share
Basic	$ 0.69	$ 0.61	$ 2.07	$ 1.58
Diluted	$ 0.68	$ 0.60	$ 2.04	$ 1.55
Shares used in computing earnings per common share
Basic	54,930	56,713	54,830	56,494
Diluted	55,838	57,673	55,769	57,486