Acquisitions, Additional Information (Detail) - USD ($) $ in Thousands		12 Months Ended
	Oct. 03, 2014	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2013	May. 01, 2013	Dec. 20, 2012
Payments to Acquire Businesses, Gross		$ 104,462	$ 150	$ 97,099
Business Acquisition, Contingent Consideration, at Fair Value		7,291	5,152
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets		1,381
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets		1,955
Goodwill		354,907	329,520	319,478
ClinIntel Acquisition [Member]
Payments to Acquire Businesses, Gross	$ 93,582
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Receivables		4,896
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles		62,390
Goodwill		24,100
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets		94,683
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities, Current		1,101
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities		1,101
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net		93,582
Liquent Acquisition [Member]
Business Acquisition, Cost of Acquired Entity, Purchase Price			$ 74,300
Heron Acquisition [Member]
Business Acquisition, Cost of Acquired Entity, Purchase Price				$ 22,800
Business Acquisition, Contingent Consideration, Potential Cash Payment		14,200			$ 14,200
Business Acquisition, Contingent Consideration, at Fair Value					$ 5,900
Atlas [Member]
Goodwill		1,400
2012 Term Loan [Member]
Short-term Debt						$ 100,000
Customer Relationships [Member] | ClinIntel Acquisition [Member]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles		$ 56,300
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life		10 years
Order or Production Backlog [Member] | ClinIntel Acquisition [Member]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles		$ 4,730
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life		1 year
Trade Names [Member] | ClinIntel Acquisition [Member]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles		$ 1,360
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life		5 years