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Document and Entity Information - USD ($)
 12 Months Ended
Jun. 30, 2020
Aug. 07, 2020
Dec. 31, 2019
Cover [Abstract]      
Document Type 10-K    
Amendment Flag false    
Document Period End Date Jun. 30, 2020    
Document Fiscal Year Focus 2020    
Document Fiscal Period Focus FY    
Trading Symbol MYGN    
Entity File Number 0-26642    
Entity Tax Identification Number 87-0494517    
Entity Address, Address Line One 320 Wakara Way    
Entity Address, City or Town Salt Lake City    
Entity Address, Postal Zip Code 84108    
City Area Code 801    
Local Phone Number 584-3600    
Entity Address, State or Province UT    
Entity Registrant Name MYRIAD GENETICS, INC.    
Entity Central Index Key 0000899923    
Current Fiscal Year End Date --06-30    
Entity Well-known Seasoned Issuer Yes    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Voluntary Filers No    
Entity Filer Category Large Accelerated Filer    
Entity Shell Company false    
Entity Small Business false    
Entity Emerging Growth Company false    
Title of 12(b) Security Public Common Stock, $0.01 par value    
Security Exchange Name NASDAQ    
Entity Incorporation, State or Country Code DE    
Document Annual Report true    
Document Transition Report false    
Entity Common Stock, Shares Outstanding   74,709,313  
Entity Public Float     $ 2,029,635,485
Documents Incorporated by Reference

DOCUMENTS INCORPORATED BY REFERENCE

The following documents (or parts thereof) are incorporated by reference into the following parts of this Form 10-K:  Certain information required in Part III of this Annual Report on Form 10-K is incorporated from the Registrant's Proxy Statement, to be filed no later than 120 days following June 30, 2020, for the Annual Meeting of Stockholders to be held on December 4, 2020.