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Employee Deferred Savings Plan - Additional Information (Detail) | 3 Months Ended
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Sep. 30, 2017
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