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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, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2015
Segment Reporting [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Total operating income for reportable segments | $ 15.9 | $ 14.6 | $ 3.1 | $ 85.1 | $ 18.9 | $ 5.5 | $ 17.2 | $ 7.1 | $ 118.7 | $ 48.7 | $ 153.4 | $ 133.6
Interest income | 0.5 | 0.5 | 0.4 | 0.4 | 0.3 | 0.3 | 0.3 | 0.3 | 1.8 | 1.2 | 0.9 | 0.4
Interest expense | (1.1) | (0.5) | (0.7) | (0.9) | (1.2) | (1.5) | (2.6) | (0.7) | (3.2) | (6.0) | (0.3) | (0.2)
Other | 0.8 | (0.5) | (0.4) | (0.3) | (0.1) | 1.5 | (2.6) | (1.8) | (0.4) | (3.0) | 2.0 | 0.5
Income before income tax | 16.1 | 14.1 | 2.4 | 84.3 | 17.9 | 5.8 | 12.3 | 4.9 | 116.9 | 40.9 | 156.0 | 134.3
Income tax provision | 3.0 | 4.5 | (26.3) | 4.8 | 5.8 | 3.0 | 6.2 | 5.6 | (14.0) | 20.6 | 38.8 | 54.5
Net income | 13.1 | 9.6 | 28.7 | 79.5 | 12.1 | 2.8 | 6.1 | (0.7) | 130.9 | 20.3 | 117.2 | 79.8
Net loss attributable to non-controlling interest |  | (0.1) |  | (0.1) | (0.2) |  |  |  | (0.2) | (0.2) |  |
Net income attributable to Myriad Genetics, Inc. stockholders | $ 13.1 | $ 9.7 | $ 28.7 | $ 79.6 | $ 12.3 | $ 2.8 | $ 6.1 | $ (0.7) | $ 131.1 | $ 20.5 | $ 117.2 | $ 79.8

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