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Segment and Related Information - Additional Information (Detail)	12 Months Ended
	Jun. 30, 2018 Segment Customer	Jun. 30, 2017 Customer	Jun. 30, 2016 Customer
Segment Reporting [Abstract]
Number of reportable segment | Segment	2
Number of major customers comprising more than ten10 % of revenues. | Customer	0	0	0

X

- Definition

Number of major customers comprising more than ten percent of revenues.

+ References

No definition available.

+ Details

Name:	mygn_NumberOfMajorCustomersComprisingMoreThanTenPercentOfRevenues
Namespace Prefix:	mygn_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

+ References

No definition available.

+ Details

Name:	us-gaap_NumberOfReportableSegments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

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