XML 26 R89.htm IDEA: XBRL DOCUMENT v3.2.0.727

Employee Deferred Savings Plan -Company's Recorded Contributions To Plan (Detail) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2013
Savings Plan [Line Items]
Deferred savings plan Company contributions	$ 5.1	$ 4.4	$ 3.5

X

- Definition

Savings Plan [Line Items]

+ References

No definition available.

+ Details

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

X

- Definition

The increase in the fair value of plan assets from contributions made by the employer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 715



-SubTopic 20



-Section 50



-Paragraph 1



-Subparagraph (b)(3)



-URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920

+ Details

Name:	us-gaap_DefinedBenefitPlanContributionsByEmployer
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration