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Other Long Term Liabilities - Additional Information (Detail) | Mar. 31, 2020 plan
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Other Liabilities Disclosure [Abstract] |
Number of defined benefit pension plans | 2

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- Definition Number of defined benefit pension plans. + References No definition available. + Details
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Namespace Prefix: | mygn_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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