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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, 2018 | Mar. 31, 2017 | Mar. 31, 2018 | Mar. 31, 2017
Segment Reporting [Abstract] |  |  |  |
Total operating income for reportable segments | $ 17.0 | $ 7.7 | $ 109.0 | $ 30.4
Interest income | 0.5 | 0.3 | 1.2 | 0.9
Interest expense | (0.5) | (1.5) | (2.2) | (4.8)
Other | (0.5) | 1.5 | (1.3) | (2.4)
Income before income tax | 16.5 | 8.0 | 106.7 | 24.1
Income tax provision | 5.2 | 3.8 | (17.7) | 15.2
Net income | 11.3 | 4.2 | 124.4 | 8.9
Net loss attributable to non-controlling interest | (0.1) |  | (0.2) | (0.1)
Net income attributable to Myriad Genetics, Inc. stockholders | $ 11.4 | $ 4.2 | $ 124.6 | $ 9.0

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