XML 106 R92.htm IDEA: XBRL DOCUMENT
v3.19.2

Commitments and Contingencies - Additional Information (Detail) $ in Millions |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jul. 18, 2019 USD ($) | Dec. 31, 2018 ft² | Jun. 30, 2018 Lease
Commitments and Contingencies [Line Items] |  |  |
Lease, not yet commenced, description |  |  | in December 2018 we entered into a lease agreement for a building yet to be constructed which shall contain approximately 125,000 square feet of additional office space upon completion at our corporate headquarters. Construction began in July 2019 and we anticipate completion of the building during fiscal 2021.
Lease, not yet commenced, area of additional office space agreed to be leased | ft² |  | 125,000 |
Myriad RBM [Member] |  |  |
Commitments and Contingencies [Line Items] |  |  |
Non-cancelable operating leases |  |  | 1
Operating leases expiration period |  |  | 2020
Administrative Functions [Member] | Minimum [Member] |  |  |
Commitments and Contingencies [Line Items] |  |  |
Operating leases expiration period |  |  | 2019
Administrative Functions [Member] | Maximum [Member] |  |  |
Commitments and Contingencies [Line Items] |  |  |
Operating leases expiration period |  |  | 2024
Information Technology Equipment [Member] |  |  |
Commitments and Contingencies [Line Items] |  |  |
Non-cancelable operating leases |  |  | 8
Operating leases expiration period |  |  | 2020
Information Technology Equipment [Member] | Maximum [Member] |  |  |
Commitments and Contingencies [Line Items] |  |  |
Operating leases expiration period |  |  | 2021
Salt Lake City, Utah [Member] |  |  |
Commitments and Contingencies [Line Items] |  |  |
Non-cancelable operating leases |  |  | 6
Salt Lake City, Utah [Member] | Minimum [Member] |  |  |
Commitments and Contingencies [Line Items] |  |  |
Operating leases expiration period |  |  | 2022
Salt Lake City, Utah [Member] | Maximum [Member] |  |  |
Commitments and Contingencies [Line Items] |  |  |
Operating leases expiration period |  |  | 2027
Germany [Member] |  |  |
Commitments and Contingencies [Line Items] |  |  |
Non-cancelable operating leases |  |  | 1
Operating leases expiration period |  |  | 2022
South San Francisco, California [Member] |  |  |
Commitments and Contingencies [Line Items] |  |  |
Non-cancelable operating leases |  |  | 2
Operating leases expiration period |  |  | 2025
Mason, Ohio and Toronto, Canada [Member] |  |  |
Commitments and Contingencies [Line Items] |  |  |
Non-cancelable operating leases |  |  | 3
Mason, Ohio and Toronto, Canada [Member] | Minimum [Member] |  |  |
Commitments and Contingencies [Line Items] |  |  |
Operating leases expiration period |  |  | 2019
Mason, Ohio and Toronto, Canada [Member] | Maximum [Member] |  |  |
Commitments and Contingencies [Line Items] |  |  |
Operating leases expiration period |  |  | 2024
Subsequent Event [Member] | Qui Tam Relator [Member] |  |  |
Commitments and Contingencies [Line Items] |  |  |
Settlement agreement date | July 18, 2019 |  |
Settlement amount | $ | $ 9.1 |  |

X
- Definition Commitments and contingencies. + References No definition available. + Details
Name: | mygn_CommitmentsAndContingenciesLineItems
Namespace Prefix: | mygn_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Lessor, operating lease, lease not yet commenced, area of additional office space. + References No definition available. + Details
Name: | mygn_LessorOperatingLeaseLeaseNotYetCommencedAreaOfAdditionalOfficeSpace
Namespace Prefix: | mygn_
Data Type: | num:areaItemType
Balance Type: | na
Period Type: | duration

X
- Definition Non-cancelable lease expiration year. + References No definition available. + Details
Name: | mygn_NonCancelableLeaseExpirationYear
Namespace Prefix: | mygn_
Data Type: | xbrli:gYearItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of non-cancelable operating leases + References No definition available. + Details
Name: | mygn_NumberOfNonCancelableOperatingLeases
Namespace Prefix: | mygn_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Description of lessor's operating lease that has not yet commenced. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 30 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=77888428&loc=SL77919359-209981 + Details
Name: | us-gaap_LessorOperatingLeaseLeaseNotYetCommencedDescription
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount awarded to other party in judgment or settlement of litigation. + References No definition available. + Details
Name: | us-gaap_LitigationSettlementAmountAwardedToOtherParty
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The effective date of a duly executed litigation settlement agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82911808&loc=d3e14326-108349 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82911808&loc=d3e14557-108349 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82911808&loc=d3e14435-108349 + Details
Name: | us-gaap_LossContingencySettlementAgreementDate
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_BusinessAcquisitionAxis=mygn_MyriadRulesBasedMedicineMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=mygn_AdministrativeFunctionsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_TechnologyEquipmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementGeographicalAxis=mygn_SaltLakeCityUtahMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementGeographicalAxis=country_DE
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementGeographicalAxis=stpr_CA
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementGeographicalAxis=mygn_MasonOhioAndTorontoCanadaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

X
- Details
Name: | srt_LitigationCaseAxis=mygn_LitigationWithQuiTamRelatorMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |