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Segment and Related Information - Schedule of Total Operating Income for Reportable Segments (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2015
Segment Reporting [Abstract] |  |  |
Total operating income for reportable segments | $ 49.4 | $ 166.8 | $ 134.2
Interest income | 1.2 | 0.9 | 0.4
Interest expense | (6.0) | (0.3) | (0.2)
Change in the fair value of contingent consideration | 0.8 |  |
Other | (2.5) | 1.5 | 0.5
Income before income tax | 42.9 | 168.9 | 134.9
Income tax provision | 21.3 | 43.6 | 54.7
Net income | 21.6 | 125.3 | 80.2
Net loss attributable to non-controlling interest | (0.2) |  |
Net income attributable to Myriad Genetics, Inc. stockholders | $ 21.8 | $ 125.3 | $ 80.2

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