Segment And Related Information (Schedule Of Segment Performance Based On Income (Loss) From Continuing Operations Before Interest Income And Other Income And Expense) (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2010
Segment Reporting Information [Line Items]
Revenues	$ 496,005	$ 402,084	$ 362,648
Depreciation and amortization	9,069	7,219	7,084
Segment operating income (loss)	180,318	157,778	135,075
Research [Member]
Segment Reporting Information [Line Items]
Depreciation and amortization	2,282	1,976	2,215
Segment operating income (loss)	(55,471)	(48,651)	(44,182)
Molecular Diagnostics [Member]
Segment Reporting Information [Line Items]
Revenues	472,390	400,046	362,648
Depreciation and amortization	5,134	5,105	4,869
Segment operating income (loss)	243,977	206,840	179,257
Companion Diagnostics [Member]
Segment Reporting Information [Line Items]
Revenues	23,615	2,038
Depreciation and amortization	1,653	138
Segment operating income (loss)	$ (8,188)	$ (411)