Condensed Consolidated Statements Of Income and Comprehensive Income (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2013	Mar. 31, 2012
Income Statement [Abstract]
Service revenue	$ 454,493	$ 355,992	$ 1,271,314	$ 1,003,897
Reimbursement revenue	68,958	56,037	197,794	156,592
Total revenue	523,451	412,029	1,469,108	1,160,489
Direct costs	311,917	241,445	892,646	691,718
Reimbursable out-of-pocket expenses	68,958	56,037	197,794	156,592
Selling, general and administrative	88,038	67,159	229,975	192,506
Depreciation	15,773	15,166	46,030	44,199
Amortization of Intangible Assets	2,891	2,198	6,018	6,542
Restructuring (benefit) charges	(732)	1,807	(1,150)	5,669
Total costs and expenses	486,845	383,812	1,371,313	1,097,226
Income from operations	36,606	28,217	97,795	63,263
Investment Income, Interest	806	1,250	2,940	4,009
Interest expense	(3,392)	(3,152)	(8,363)	(9,598)
Miscellaneous income (expense)	1,813	(4,373)	2,053	(2,856)
Total other expense	(773)	(6,275)	(3,370)	(8,445)
Income before income taxes	35,833	21,942	94,425	54,818
Provision for income taxes	6,309	(927)	28,494	9,448
Net income	29,524	22,869	65,931	45,370
Earnings per common share
Basic	$ 0.51	$ 0.38	$ 1.12	$ 0.76
Diluted	$ 0.50	$ 0.38	$ 1.10	$ 0.75
Shares used in computing earnings per common share
Basic	58,024	59,652	58,942	59,319
Diluted	59,074	60,494	60,005	60,272
Statement [Line Items]
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	$ 13,118	$ 36,181	$ 69,675	$ 13,386