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Stockholders' Equity - Additional Information (Detail) (Sixth Share Repurchase Program, USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Nov. 30, 2013
Sixth Share Repurchase Program
Stockholders Equity Note [Line Items]
Share repurchase program, authorized amount		$ 300us-gaap_StockRepurchaseProgramAuthorizedAmount1 / us-gaap_ShareRepurchaseProgramAxis = mygn_SixthShareRepurchaseProgramMember
Share repurchase program, remaining authorized repurchase amount	$ 61.7us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1 / us-gaap_ShareRepurchaseProgramAxis = mygn_SixthShareRepurchaseProgramMember

X

- Details

Name:	mygn_StockholdersEquityNoteLineItems
Namespace Prefix:	mygn_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- 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

X

- Definition

Amount remaining of a stock repurchase plan authorized.

+ References

No definition available.

+ Details

Name:	us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant