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Schedule of Share-Based Compensation Recognized in Consolidated Statements of Comprehensive Income (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2014	Mar. 31, 2013
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total share-based compensation expense	$ 13,640	$ 6,731	$ 27,432	$ 20,435
Cost Of Molecular Diagnostic Testing
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total share-based compensation expense	207	252	639	811
Cost Of Companion Diagnostic Services
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total share-based compensation expense	75	54	212	159
Research And Development Expense
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total share-based compensation expense	3,042	818	4,670	2,496
Selling, General, and Administrative Expenses
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total share-based compensation expense	$ 10,316	$ 5,607	$ 21,911	$ 16,969