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Employee Deferred Savings Plan (Tables) | 9 Months Ended
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Mar. 31, 2018
Postemployment Benefits [Abstract] |
Recorded Contributions to Employee Deferred Savings Plan | The Company recorded contributions to the plan as follows:
|  | Three months ended |  |  | Nine months ended |
|  | March 31, |  |  | March 31, |
|  | 2018 |  |  | 2017 |  |  | 2018 |  |  | 2017 |
Deferred savings plan contributions |  | $ | 1.9 |  |  | $ | 1.8 |  |  | $ | 5.4 |  |  | $ | 4.8 |

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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_
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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