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Segment and Related Information - Schedule of Total Operating Income for Reportable Segments (Detail) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Segment Reporting [Abstract]        
Total operating income for reportable segments $ 4.4 $ 17.0 $ 91.9 $ 22.6
Interest income 0.4 0.3 0.8 0.6
Interest expense (0.7) (2.6) (1.7) (3.3)
Other (0.4) (2.6) (0.7) (3.8)
Income before income tax 3.7 12.1 90.3 16.1
Income tax provision (28.4) 6.2 (22.8) 11.4
Net income 32.1 5.9 113.1 4.7
Net loss attributable to non-controlling interest     (0.1)  
Net income attributable to Myriad Genetics, Inc. stockholders $ 32.1 $ 5.9 $ 113.2 $ 4.7