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OTHER LONG-TERM LIABILITIES - Narrative (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Other Liabilities Disclosure [Abstract] |  |
Escrow liability | $ 7.5 | $ 7.5
Legal settlements | $ 24.0 | $ 0.0

X
- Definition Escrow Liability, Noncurrent + References No definition available. + Details
Name: | mygn_EscrowLiabilityNoncurrent
Namespace Prefix: | mygn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Legal Charges Pending Settlement, Noncurrent + References No definition available. + Details
Name: | mygn_LegalChargesPendingSettlementNoncurrent
Namespace Prefix: | mygn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- References No definition available. + Details
Name: | us-gaap_OtherLiabilitiesDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration