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Segment and Related Information - Schedule of Total Operating Income for Reportable Segments (Detail) - USD ($)
$ in Millions
 3 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Segment Reporting [Abstract]    
Total operating income for reportable segments $ 1.2 $ 84.0
Interest income 0.7 0.4
Interest expense (2.2) (0.9)
Other 1.1 (0.3)
Income before income tax 0.8 83.2
Income tax provision 1.6 4.5
Net income (loss) (0.8) 78.7
Net loss attributable to non-controlling interest (0.1) (0.1)
Net income (loss) attributable to Myriad Genetics, Inc. stockholders $ (0.7) $ 78.8