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v3.10.0.1

Commitment and Contingencies - Additional Information (Detail) | 12 Months Ended
--- | ---
Jun. 30, 2018 USD ($) Lease
Commitments and Contingencies [Line Items] |
Claims made against the company | $ | $ 0
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 | 2018
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 | 3
Operating leases expiration period | 2018
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 | 5
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 | 2018
Cancelable operating leases | 1
Cancelable operating leases expiration period | 2019
South San Francisco, California [Member] |
Commitments and Contingencies [Line Items] |
Non-cancelable operating leases | 1
Operating leases expiration period | 2021
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 | 2018
Mason, Ohio and Toronto, Canada [Member] | Maximum [Member] |
Commitments and Contingencies [Line Items] |
Operating leases expiration period | 2024

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

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- 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

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

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

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

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

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

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

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

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

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

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

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