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Subsequent Events (Details) - USD ($)	Jul. 26, 2022	Dec. 31, 2022	Jul. 25, 2022	Jul. 19, 2022	Sep. 30, 2021	Feb. 22, 2021	Feb. 21, 2021	Jul. 31, 2018	Dec. 23, 2016
Amended facility | Subsequent event
Subsequent Event [Line Items]
Line of credit facility, credit exposure threshold	$ 0
Revolving credit facility
Subsequent Event [Line Items]
Maximum aggregate principal commitment									$ 300,000,000
Revolving credit facility | Amended facility
Subsequent Event [Line Items]
Maximum aggregate principal commitment					$ 250,000,000	$ 300,000,000	$ 350,000,000	$ 350,000,000
Revolving credit facility | Amended facility | Forecast
Subsequent Event [Line Items]
Maximum aggregate principal commitment		$ 150,000,000
Revolving credit facility | Amended facility | Subsequent event
Subsequent Event [Line Items]
Maximum aggregate principal commitment	200,000,000		$ 250,000,000
Reduction in maximum borrowing capacity in event of certain asset sales				$ 50,000,000
Letter of Credit | Amended facility | Subsequent event
Subsequent Event [Line Items]
Line of credit facility, credit exposure threshold	$ 5,000,000

X

- Definition

Line Of Credit Facility, Credit Exposure Threshold

+ References

No definition available.

+ Details

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Namespace Prefix:	mygn_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Line Of Credit Facility, Reduction In Maximum Borrowing Capacity In Event Of Asset Sales

+ References

No definition available.

+ Details

Name:	mygn_LineOfCreditFacilityReductionInMaximumBorrowingCapacityInEventOfAssetSales
Namespace Prefix:	mygn_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- 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

X

- Details

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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:	us-gaap_CreditFacilityAxis=us-gaap_RevolvingCreditFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: