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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