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Employee Deferred Savings Plan (Tables) | 6 Months Ended
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Dec. 31, 2018
Postemployment Benefits [Abstract] |
Company Recorded Contributions To Plan | The Company recorded contributions to the plan as follows:
|  | Three months ended |  |  | Six months ended |
|  | December 31, |  |  | December 31, |
|  | 2018 |  |  | 2017 |  |  | 2018 |  |  | 2017 |
Deferred savings plan contributions |  | $ | 1.7 |  |  | $ | 1.6 |  |  | $ | 3.7 |  |  | $ | 3.5 |

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- Definition Schedule of recorded contributions by employer to employee deferred savings plan. + References No definition available. + Details
Name: | mygn_ScheduleOfRecordedContributionsByEmployerToEmployeeDeferredSavingsPlanTableTextBlock
Namespace Prefix: | mygn_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

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