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Schedule Of Stock Repurchase Program (Detail) (USD $) | 1 Months Ended |
--- | --- | ---
Nov. 30, 2013 | Feb. 28, 2013 | Aug. 31, 2011 | Mar. 31, 2011 | Aug. 31, 2010 | May 31, 2010 | Jun. 30, 2014
Stockholders Equity [Line Items] |  |  |  |  |  |  |
Date Authorized | 2013-11 | 2013-02 | 2011-08 | 2011-03 | 2010-08 | 2010-05 |
Amount Authorized | $ 300,000,000 | $ 200,000,000 | $ 200,000,000 | $ 100,000,000 | $ 100,000,000 | $ 100,000,000 | $ 1,000,000,000
Date Completed |  | 2013-11 | 2013-01 | 2011-09 | 2011-02 | 2010-08 |
Date Completed | ongoing |  |  |  |  |  |

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- Definition Common Stock Authorized For Repurchase Expiration Date + References No definition available. + Details
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Namespace Prefix: | mygn_
Data Type: | xbrli:gYearMonthItemType
Balance Type: | na
Period Type: | duration

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- Definition The status of authorized stock repurchase programs not complete as of the reporting period end date. + References No definition available. + Details
Name: | mygn_RepurchaseProgramDateCompletedDescription
Namespace Prefix: | mygn_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Share Repurchase Program Commencement Date + References No definition available. + Details
Name: | mygn_ShareRepurchaseProgramCommencementDate
Namespace Prefix: | mygn_
Data Type: | xbrli:gYearMonthItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | mygn_StockholdersEquityLineItems
Namespace Prefix: | mygn_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of stock repurchase plan authorized. + References No definition available. + Details
Name: | us-gaap_StockRepurchaseProgramAuthorizedAmount1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant