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Segment and Related Information - Schedule of Total Operating Income for Reportable Segments (Detail) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | [1] | Mar. 31, 2018 | [1] | Dec. 31, 2017 | [1] | Sep. 30, 2017 | [1] | Jun. 30, 2019 | Jun. 30, 2018 | [1] | Jun. 30, 2017 | [1]
Segment Reporting [Abstract] |  |  |  |  |  |  |  |  |  |  |
Total operating income for reportable segments | $ (5.6) | $ 5.9 | $ 6.1 | $ 1.2 | $ 17.8 | $ 13.8 | $ 6.3 | $ 84.0 | $ 7.6 | $ 121.9 | $ 44.0
Interest income | 0.9 | 0.7 | 0.9 | 0.7 | 0.5 | 0.5 | 0.4 | 0.4 | 3.2 | 1.8 | 1.2
Interest expense | (3.2) | (3.2) | (3.4) | (2.2) | (1.1) | (0.5) | (0.7) | (0.9) | (12.0) | (3.2) | (6.0)
Other | 0.2 | (0.1) |  | 1.1 | 0.8 | (0.5) | (0.4) | (0.3) | 1.2 | (0.4) | (3.0)
Income before income tax | (7.7) | 3.3 | 3.6 | 0.8 | 18.0 | 13.3 | 5.6 | 83.2 | 0.0 | 120.1 | 36.2
Income tax provision (benefit) | (3.4) | (3.6) | 1.0 | 1.6 | 3.5 | 4.3 | (25.3) | 4.5 | (4.4) | (13.0) | 19.0
Net income | (4.3) | 6.9 | 2.6 | (0.8) | 14.5 | 9.0 | 30.9 | 78.7 | 4.4 | 133.1 | 17.2
Net loss attributable to non-controlling interest | (0.1) |  |  | (0.1) |  | (0.1) |  | (0.1) | (0.2) | (0.2) | (0.2)
Net income attributable to Myriad Genetics, Inc. stockholders | $ (4.2) | $ 6.9 | $ 2.6 | $ (0.7) | $ 14.5 | $ 9.1 | $ 30.9 | $ 78.8 | $ 4.6 | $ 133.3 | $ 17.4
[1] | Amounts adjusted due to the adoption of Accounting Standards Update No. 2014-09, Revenue from Contracts with Customers (Topic 606). See Note 1 to the financial statements of this report for additional information.

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