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Cover - USD ($)
 6 Months Ended
Dec. 31, 2020
Mar. 09, 2021
Jun. 30, 2020
Cover [Abstract]      
Document Type 10-KT    
Document Annual Report false    
Document Transition Report true    
Document Period Start Date Jul. 01, 2020    
Document Period End Date Dec. 31, 2020    
Current Fiscal Year End Date --12-31    
Entity File Number 0-26642    
Entity Registrant Name MYRIAD GENETICS, INC.    
Entity Central Index Key 0000899923    
Document Fiscal Year Focus 2020    
Document Fiscal Period Focus FY    
Amendment Flag false    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 87-0494517    
Entity Address, Address Line One 320 Wakara Way    
Entity Address, City or Town Salt Lake City    
Entity Address, State or Province UT    
Entity Address, Postal Zip Code 84108    
City Area Code 801    
Local Phone Number 584-3600    
Title of 12(b) Security Common Stock, $0.01 par value    
Trading Symbol MYGN    
Security Exchange Name NASDAQ    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Large Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
ICFR Auditor Attestation Flag true    
Entity Shell Company false    
Entity Public Float     $ 847,193,483
Entity Common Stock, Shares Outstanding   76,297,150  
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 Transition Report on Form 10-K is incorporated from the Registrant's Proxy Statement, to be filed no later than 120 days following December 31, 2020, for the Annual Meeting of Stockholders to be held on June 3, 2021.