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Basis of Presentation - Adoption of New Revenue Recognition Standard Revenue Impacted Previously Reported (Detail) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Jun. 30, 2018
Consolidated Statements of Operations:      
Total revenue $ 202.3 $ 178.8  
Selling, general, and administrative expense 129.9 107.2  
Income tax provision 1.6 4.5  
Net income (loss) attributable to Myriad Genetics, Inc. stockholders $ (0.7) $ 78.8  
Earnings per share:      
Basic $ (0.01) $ 1.15  
Diluted $ (0.01) $ 1.12  
Consolidated Statements of Cash Flows:      
Net income (loss) attributable to Myriad Genetics, Inc. stockholders $ (0.7) $ 78.8  
Trade accounts receivable (3.3) (6.2)  
Consolidated Balance Sheet:      
Trade accounts receivable 119.1   $ 99.5
Retained earnings $ 53.4   54.1
ASC 606 | As Previously Reported      
Consolidated Statements of Operations:      
Total revenue   187.9  
Selling, general, and administrative expense   115.2  
Income tax provision   4.8  
Net income (loss) attributable to Myriad Genetics, Inc. stockholders   $ 79.6  
Earnings per share:      
Basic   $ 1.16  
Diluted   $ 1.13  
Consolidated Statements of Cash Flows:      
Net income (loss) attributable to Myriad Genetics, Inc. stockholders   $ 79.6  
Trade accounts receivable   (16.5)  
Consolidated Balance Sheet:      
Trade accounts receivable     98.3
Retained earnings     52.9
ASC 606 | Adjustments      
Consolidated Statements of Operations:      
Total revenue   (9.1)  
Selling, general, and administrative expense   (8.0)  
Income tax provision   (0.3)  
Net income (loss) attributable to Myriad Genetics, Inc. stockholders   $ (0.8)  
Earnings per share:      
Basic   $ (0.01)  
Diluted   $ (0.01)  
Consolidated Statements of Cash Flows:      
Net income (loss) attributable to Myriad Genetics, Inc. stockholders   $ (0.8)  
Trade accounts receivable   $ 10.3  
Consolidated Balance Sheet:      
Trade accounts receivable     1.2
Retained earnings     $ 1.2