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Segment and Related Information - Schedule of Total Operating Income for Reportable Segments (Detail) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2018
Mar. 31, 2017
Segment Reporting [Abstract]        
Total operating income for reportable segments $ 17.0 $ 7.7 $ 109.0 $ 30.4
Interest income 0.5 0.3 1.2 0.9
Interest expense (0.5) (1.5) (2.2) (4.8)
Other (0.5) 1.5 (1.3) (2.4)
Income before income tax 16.5 8.0 106.7 24.1
Income tax provision 5.2 3.8 (17.7) 15.2
Net income 11.3 4.2 124.4 8.9
Net loss attributable to non-controlling interest (0.1)   (0.2) (0.1)
Net income attributable to Myriad Genetics, Inc. stockholders $ 11.4 $ 4.2 $ 124.6 $ 9.0