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Stockholders' Equity - Additional Information (Detail) (Sixth Share Repurchase Program, USD $) In Millions, unless otherwise specified | 1 Months Ended | 9 Months Ended
--- | --- | ---
Nov. 30, 2013 | Mar. 31, 2014
Sixth Share Repurchase Program |  |
Stockholders Equity Note [Line Items] |  |
Share repurchase program, authorized amount | $ 300 |
Share repurchase program, remaining authorized repurchase amount |  | $ 231.4

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

X
- Definition Amount of a stock repurchase plan authorized by an entity's Board of Directors. + References No definition available. + Details
Name: | us-gaap_StockRepurchaseProgramAuthorizedAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Amount remaining of a stock repurchase plan authorized by an entity's Board of Directors. + References No definition available. + Details
Name: | us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration