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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, 2019 | Sep. 30, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Dec. 31, 2019 | Dec. 31, 2018
Segment Reporting [Abstract] |  |  |  |  |  |
Total operating income (loss) for reportable segments | $ (8.8) |  | $ 6.1 |  | $ (29.7) | $ 7.3
Interest income | 0.8 |  | 0.9 |  | 1.7 | 1.6
Interest expense | (2.5) |  | (3.4) |  | (5.4) | (5.6)
Other | (0.9) |  |  |  | (0.3) | 1.1
Income (loss) before income tax | (11.4) |  | 3.6 |  | (33.7) | 4.4
Income tax provision (benefit) | (3.1) |  | 1.0 |  | (4.8) | 2.6
Net income (loss) | (8.3) |  | 2.6 |  | (28.9) | 1.8
Net loss attributable to non-controlling interest |  |  |  |  |  | (0.1)
Net income (loss) attributable to Myriad Genetics, Inc. stockholders | $ (8.3) | $ (20.6) | $ 2.6 | $ (0.7) | $ (28.9) | $ 1.9

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