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Schedule of Share-Based Compensation Recognized in Consolidated Statements of Comprehensive Income (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2012
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]      
Total share-based compensation expense $ 33,997 $ 26,612 $ 26,275
Cost Of Molecular Diagnostic Testing
     
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]      
Total share-based compensation expense 833 1,030 1,158
Cost of Pharmaceutical and Clinical Services
     
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]      
Total share-based compensation expense 317 219 85
Research And Development Expense
     
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]      
Total share-based compensation expense 5,429 3,246 3,350
Selling, General, and Administrative Expenses
     
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]      
Total share-based compensation expense $ 27,418 $ 22,117 $ 21,682