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Employee Deferred Savings Plan (Tables) | 12 Months Ended
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Jun. 30, 2015
Recorded Contributions to Employee Deferred Savings Plan | The Company’s recorded contributions to the plan as follows:
|  | Years Ended June 30, |
|  | 2015 |  |  | 2014 |  |  | 2013 |
Deferred savings plan Company contributions |  | $ | 5.1 |  |  | $ | 4.4 |  |  | $ | 3.5 |

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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