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Segment and Related Information - Schedule of Total Operating Income for Reportable Segments (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Mar. 31, 2017 | Mar. 31, 2016 | Mar. 31, 2017 | Mar. 31, 2016
Segment Reporting [Abstract] |  |  |  |
Total operating income for reportable segments | $ 12.9 | $ 42.6 | $ 32.4 | $ 131.2
Interest income | 0.3 | 0.3 | 0.9 | 0.5
Interest expense | (1.5) |  | (4.8) | (0.2)
Change in the fair value of contingent consideration | (5.2) |  | (2.0) |
Other | 1.5 | 0.2 | (2.4) | 0.2
Income before income tax | 8.0 | 43.1 | 24.1 | 131.7
Income tax provision | 3.8 | 8.6 | 15.2 | 29.7
Net income | 4.2 | 34.5 | 8.9 | 102.0
Net loss attributable to non-controlling interest | 0.0 | 0.0 | (0.1) | 0.0
Net income attributable to Myriad Genetics, Inc. stockholders | $ 4.2 | $ 34.5 | $ 9.0 | $ 102.0

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