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v3.20.1

Employee Deferred Savings Plan - Additional Information (Detail) | 9 Months Ended
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Mar. 31, 2020
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%

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- 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

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- 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

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- References No definition available. + Details
Name: | us-gaap_CompensationAndRetirementDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration