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v3.19.2

Employee Deferred Savings Plan (Tables) | 12 Months Ended
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Jun. 30, 2019
Postemployment Benefits [Abstract] |
Company Recorded Contributions To Plan | The Company’s recorded contributions to the plan as follows:
|  | Years Ended June 30, |
|  | 2019 |  |  | 2018 |  |  | 2017 |
Deferred savings plan Company contributions |  | $ | 8.3 |  |  | $ | 7.2 |  |  | $ | 6.6 |

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- Definition Schedule of recorded contributions by employer to employee deferred savings plan. + References No definition available. + Details
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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