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Segment and Related Information - Schedule of Total Operating Income for Reportable Segments (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016
Segment Reporting [Abstract] |  |  |  |
Total operating income for reportable segments | $ 4.4 | $ 17.0 | $ 91.9 | $ 22.6
Interest income | 0.4 | 0.3 | 0.8 | 0.6
Interest expense | (0.7) | (2.6) | (1.7) | (3.3)
Other | (0.4) | (2.6) | (0.7) | (3.8)
Income before income tax | 3.7 | 12.1 | 90.3 | 16.1
Income tax provision | (28.4) | 6.2 | (22.8) | 11.4
Net income | 32.1 | 5.9 | 113.1 | 4.7
Net loss attributable to non-controlling interest |  |  | (0.1) |
Net income attributable to Myriad Genetics, Inc. stockholders | $ 32.1 | $ 5.9 | $ 113.2 | $ 4.7

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