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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, 2020
Mar. 31, 2020
Dec. 31, 2019
 [1]
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2018
Segment Reporting [Abstract]                      
Total operating income (loss) for reportable segments $ (68.3) $ (133.7) $ (8.8) $ (20.9) $ (5.6) $ 5.9 $ 6.1 $ 1.2 $ (231.7) $ 7.6 $ 121.9
Interest income 0.5 0.8 0.8 0.9 0.9 0.7 0.9 0.7 3.0 3.2 1.8
Interest expense (3.1) (2.3) (2.5) (2.9) (3.2) (3.2) (3.4) (2.2) (10.8) (12.0) (3.2)
Other 12.4 4.1 (0.9) 0.6 0.2 (0.1)   1.1 16.2 1.2 (0.4)
Income (loss) before income tax (58.5) (131.1) (11.4) (22.3) (7.7) 3.3 3.6 0.8 (223.3)   120.1
Income tax benefit (3.0) (15.9) (3.1) (1.7) (3.4) (3.6) 1.0 1.6 (23.7) (4.4) (13.0)
Net income (loss) (55.5) (115.2) (8.3) (20.6) (4.3) 6.9 2.6 (0.8) (199.6) 4.4 133.1
Net loss attributable to non-controlling interest (0.1)       (0.1)     (0.1) (0.1) (0.2) (0.2)
Net income (loss) attributable to Myriad Genetics, Inc. stockholders $ (55.4) $ (115.2) $ (8.3) $ (20.6) $ (4.2) $ 6.9 $ 2.6 $ (0.7) $ (199.5) $ 4.6 $ 133.3
[1] An immaterial prior period goodwill impairment charge of $1.3 million was previously classified as part of selling, general and administrative expense in the condensed consolidated statements of operations was reclassified to conform to the current period presentation and is included as part of the goodwill and intangible asset impairment charges financial statement line item in the current period.