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Subsequent Event (Details) - Subsequent event - Salt Lake City ft² in Thousands, $ in Millions | 2 Months Ended
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Feb. 24, 2022 USD ($) ft²
Subsequent Event [Line Items] |
Operating lease area (sq ft) | ft² | 230
Lease term (in years) | 15 years
Total future lease payments | $ | $ 77.8

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- Definition Lessee, Operating Lease, Area Of Leased Space + References No definition available. + Details
Name: | mygn_LesseeOperatingLeaseAreaOfLeasedSpace
Namespace Prefix: | mygn_
Data Type: | dtr-types:areaItemType
Balance Type: | na
Period Type: | duration

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- Definition Lessee, Operating Lease, Estimated Future Lease Payments + References No definition available. + Details
Name: | mygn_LesseeOperatingLeaseEstimatedFutureLeasePayments
Namespace Prefix: | mygn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Term of lessee's operating lease not yet commenced, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123408670&loc=SL77918673-209980 + Details
Name: | us-gaap_LesseeOperatingLeaseLeaseNotYetCommencedTermOfContract1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | instant

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- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References No definition available. + Details
Name: | us-gaap_SubsequentEventLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | mygn_LeaseArrangementAxis=mygn_SaltLakeCityLeaseMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |