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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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