XML 29 R31.htm IDEA: XBRL DOCUMENT v2.4.0.8

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

X

- 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