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Subsequent Events - Additional Information (Detail) - Subsequent Event [Member] - USD ($) $ in Millions | May 01, 2020 | Apr. 10, 2020
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Subsequent Event [Line Items] |  |
CARES act of 2020, public health and social services emergency fund amount |  | $ 8.0
CARES act of 2020, medicare payment amount |  | $ 29.7
Revolving Credit Facility [Member] | Second Amendment to Credit Facility [Member] |  |
Subsequent Event [Line Items] |  |
Debt instrument, interest rate on variable basis | 0.50% |
Excess of debt due to prepayment | $ 250.0 |
Excess of unrestricted cash | $ 100.0 |
Revolving Credit Facility [Member] | Second Amendment to Credit Facility [Member] | LIBOR Floor [Member] |  |
Subsequent Event [Line Items] |  |
Debt instrument, interest rate on variable basis | 3.50% |
Debt instrument, interest rate during the period | 1.00% |

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- Definition CARES Act of 2020 medicare payment amount. + References No definition available. + Details
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Namespace Prefix: | mygn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition CARES Act of 2020 public health and social services emergency fund amount. + References No definition available. + Details
Name: | mygn_CARESActOf2020PublicHealthAndSocialServicesEmergencyFundAmount
Namespace Prefix: | mygn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Line of credit excess of unrestricted cash condition. + References No definition available. + Details
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Namespace Prefix: | mygn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Prepayments of lines of credit exceeds. + References No definition available. + Details
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Namespace Prefix: | mygn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition The average effective interest rate during the reporting period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28551-108399 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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Balance Type: | na
Period Type: | duration

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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
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |