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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, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Mar. 31, 2020 | Mar. 31, 2019
Segment Reporting [Abstract] |  |  |  |  |  |  |  |
Total operating income (loss) for reportable segments | $ (133.7) |  |  | $ 5.9 |  |  | $ (163.4) | $ 13.2
Interest income | 0.8 |  |  | 0.7 |  |  | 2.5 | 2.3
Interest expense | (2.3) |  |  | (3.2) |  |  | (7.7) | (8.8)
Other | 4.1 |  |  | (0.1) |  |  | 3.8 | 1.0
Income (loss) before income tax | (131.1) |  |  | 3.3 |  |  | (164.8) | 7.7
Income tax provision (benefit) | (15.9) |  |  | (3.6) |  |  | (20.7) | (1.0)
Net income (loss) | (115.2) |  |  | 6.9 |  |  | (144.1) | 8.7
Net loss attributable to non-controlling interest |  |  |  |  |  |  |  | (0.1)
Net income (loss) attributable to Myriad Genetics, Inc. stockholders | $ (115.2) | $ (8.3) | $ (20.6) | $ 6.9 | $ 2.6 | $ (0.7) | $ (144.1) | $ 8.8

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