| Document and Entity Information | Feb. 06, 2020 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Feb. 6, 2020 |
| Entity Registrant Name | MYRIAD GENETICS, INC. |
| Entity Central Index Key | 0000899923 |
| Entity Emerging Growth Company | false |
| Entity File Number | 0-26642 |
| 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 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of each class | Public Common Stock, $0.01 par value |
| Trading Symbol | MYGN |
| Name of each exchange on which registered | NASDAQ |
