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Cover - USD ($)
 12 Months Ended
Dec. 31, 2022
Feb. 23, 2023
Jun. 30, 2022
Cover [Abstract]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2022    
Current Fiscal Year End Date --12-31    
Document Transition Report false    
Entity File Number 0-26642    
Entity Registrant Name MYRIAD GENETICS, INC.    
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     $ 1,465,095,487
Entity Common Stock, Shares Outstanding   81,223,713  
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 December 31, 2022, for the Annual Meeting of Stockholders expected to be held on June 1, 2023.    
Amendment Flag false    
Document Fiscal Year Focus 2022    
Document Fiscal Period Focus FY    
Entity Central Index Key 0000899923