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Segment and Related Information - Schedule of Total Operating Income for Reportable Segments (Detail) - USD ($)
$ in Millions
 12 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2015
Segment Reporting [Abstract]      
Total operating income for reportable segments $ 49.4 $ 166.8 $ 134.2
Interest income 1.2 0.9 0.4
Interest expense (6.0) (0.3) (0.2)
Change in the fair value of contingent consideration 0.8    
Other (2.5) 1.5 0.5
Income before income tax 42.9 168.9 134.9
Income tax provision 21.3 43.6 54.7
Net income 21.6 125.3 80.2
Net loss attributable to non-controlling interest (0.2)    
Net income attributable to Myriad Genetics, Inc. stockholders $ 21.8 $ 125.3 $ 80.2