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Segment and Related Information - Schedule of Significant Revenues from Major Products by Operating Segment (Detail) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2013
Segment Reporting Information [Line Items]
Revenues	$ 723.1	$ 778.2	$ 613.2
Change in Revenues	$ (55.1)	$ 165.0
Sales Revenue | Product Concentration Risk
Segment Reporting Information [Line Items]
Percentage of Total Revenue	100.00%	100.00%	100.00%
Diagnostics
Segment Reporting Information [Line Items]
Revenues	$ 695.5	$ 748.2	$ 582.4
Change in Revenues	$ (52.7)	$ 165.8
Diagnostics | Sales Revenue | Product Concentration Risk
Segment Reporting Information [Line Items]
Percentage of Total Revenue	96.00%	96.00%	95.00%
Diagnostics | myRisk
Segment Reporting Information [Line Items]
Revenues	$ 320.7	$ 53.7
Change in Revenues	$ 267.0	$ 53.7
Diagnostics | myRisk | Sales Revenue | Product Concentration Risk
Segment Reporting Information [Line Items]
Percentage of Total Revenue	44.00%	7.00%
Diagnostics | BRACAnalysis
Segment Reporting Information [Line Items]
Revenues	$ 237.6	$ 517.9	$ 460.3
Change in Revenues	$ (280.3)	$ 57.6
Diagnostics | BRACAnalysis | Sales Revenue | Product Concentration Risk
Segment Reporting Information [Line Items]
Percentage of Total Revenue	33.00%	67.00%	75.00%
Diagnostics | VectraDA
Segment Reporting Information [Line Items]
Revenues	$ 43.7	$ 14.0
Change in Revenues	$ 29.7	$ 14.0
Diagnostics | VectraDA | Sales Revenue | Product Concentration Risk
Segment Reporting Information [Line Items]
Percentage of Total Revenue	6.00%	2.00%
Diagnostics | Other
Segment Reporting Information [Line Items]
Revenues	$ 93.5	$ 162.6	$ 122.1
Change in Revenues	$ (69.1)	$ 40.5
Diagnostics | Other | Sales Revenue | Product Concentration Risk
Segment Reporting Information [Line Items]
Percentage of Total Revenue	13.00%	21.00%	20.00%
Other
Segment Reporting Information [Line Items]
Revenues	$ 27.6	$ 30.0	$ 30.8
Change in Revenues	$ (2.4)	$ (0.8)
Other | Sales Revenue | Product Concentration Risk
Segment Reporting Information [Line Items]
Percentage of Total Revenue	4.00%	4.00%	5.00%

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Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 275



-SubTopic 10



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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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