Condensed Consolidated Statements Of Income (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2014	Mar. 31, 2013
Revenues [Abstract]
Service revenue	$ 492,375	$ 454,493	$ 1,428,765	$ 1,271,314
Reimbursement revenue	85,543	68,958	252,453	197,794
Total revenue	577,918	523,451	1,681,218	1,469,108
Costs and Expenses [Abstract]
Direct costs	323,149	311,917	950,850	892,646
Reimbursable out-of-pocket expenses	85,543	68,958	252,453	197,794
Selling, general and administrative	96,602	88,038	277,042	229,975
Depreciation	16,802	15,773	48,848	46,030
Amortization of Intangible Assets	3,725	2,891	11,383	6,018
Restructuring (benefit) charges	(74)	(732)	(74)	(1,150)
Total costs and expenses	525,747	486,845	1,540,502	1,371,313
Income from operations	52,171	36,606	140,716	97,795
Interest Income (Expense), Net	(2,072)	(2,586)	(7,342)	(5,423)
Miscellaneous income (expense)	(292)	1,813	(1,694)	2,053
Total other expense	(2,364)	(773)	(9,036)	(3,370)
Income before income taxes	49,807	35,833	131,680	94,425
Provision for income taxes	15,068	6,309	42,658	28,494
Net income	$ 34,739	$ 29,524	$ 89,022	$ 65,931
Earnings per common share
Basic	$ 0.61	$ 0.51	$ 1.58	$ 1.12
Diluted	$ 0.60	$ 0.50	$ 1.55	$ 1.10
Shares used in computing earnings per common share
Basic	56,713	58,024	56,494	58,942
Diluted	57,673	59,074	57,486	60,005