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Segment and Related Information - Schedule of Total Operating Income for Reportable Segments (Detail) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Sep. 30, 2018 | Sep. 30, 2017
Segment Reporting [Abstract] |  |
Total operating income for reportable segments | $ 1.2 | $ 84.0
Interest income | 0.7 | 0.4
Interest expense | (2.2) | (0.9)
Other | 1.1 | (0.3)
Income before income tax | 0.8 | 83.2
Income tax provision | 1.6 | 4.5
Net income (loss) | (0.8) | 78.7
Net loss attributable to non-controlling interest | (0.1) | (0.1)
Net income (loss) attributable to Myriad Genetics, Inc. stockholders | $ (0.7) | $ 78.8

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