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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, 2017
Mar. 31, 2016
Mar. 31, 2017
Mar. 31, 2016
Segment Reporting [Abstract]        
Total operating income for reportable segments $ 12.9 $ 42.6 $ 32.4 $ 131.2
Interest income 0.3 0.3 0.9 0.5
Interest expense (1.5)   (4.8) (0.2)
Change in the fair value of contingent consideration (5.2)   (2.0)  
Other 1.5 0.2 (2.4) 0.2
Income before income tax 8.0 43.1 24.1 131.7
Income tax provision 3.8 8.6 15.2 29.7
Net income 4.2 34.5 8.9 102.0
Net loss attributable to non-controlling interest 0.0 0.0 (0.1) 0.0
Net income attributable to Myriad Genetics, Inc. stockholders $ 4.2 $ 34.5 $ 9.0 $ 102.0