Condensed Consolidated Statements Of Income (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2014	Dec. 31, 2013
Revenues [Abstract]
Service revenue	$ 499,269	$ 487,145	$ 990,965	$ 936,390
Reimbursement revenue	75,776	87,091	157,769	166,910
Total revenue	575,045	574,236	1,148,734	1,103,300
Costs and Expenses [Abstract]
Direct costs	327,321	324,507	646,140	627,701
Reimbursable out-of-pocket expenses	75,776	87,091	157,769	166,910
Selling, general and administrative	98,795	95,528	197,708	180,440
Depreciation	16,812	16,584	33,710	32,046
Amortization of Intangible Assets	3,557	3,862	7,043	7,658
Total costs and expenses	522,261	527,572	1,042,370	1,014,755
Income from operations	52,784	46,664	106,364	88,545
Interest Income (Expense), Net	(1,840)	(2,506)	(3,572)	(5,270)
Miscellaneous income (expense)	2,907	(1,201)	6,280	(1,402)
Total other expense	1,067	(3,707)	2,708	(6,672)
Income before income taxes	53,851	42,957	109,072	81,873
Provision for income taxes	15,091	14,628	33,170	27,590
Net income	$ 38,760	$ 28,329	$ 75,902	$ 54,283
Earnings per common share
Basic	$ 0.71	$ 0.50	$ 1.39	$ 0.96
Diluted	$ 0.70	$ 0.49	$ 1.36	$ 0.95
Shares used in computing earnings per common share
Basic	54,823	56,517	54,781	56,386
Diluted	55,709	57,395	55,736	57,395