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Employee Deferred Savings Plan - Additional Information (Detail)	9 Months Ended
	Mar. 31, 2019
Compensation And Retirement Disclosure [Abstract]
Percent of employee contribution to deferred savings plan	50.00%
Employer's contribution not to exceed percentage of the employees compensation	4.00%

X

- Definition

Employers contribution not to exceed percentage of the employees compensation.

+ References

No definition available.

+ Details

Name:	mygn_EmployersContributionNotToExceedPercentageOfEmployeesCompensation
Namespace Prefix:	mygn_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Percent of employee contribution to deferred savings plan.

+ References

No definition available.

+ Details

Name:	mygn_PercentOfEmployeeContributionToDeferredSavingsPlan
Namespace Prefix:	mygn_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

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