XML 56 R46.htm IDEA: XBRL DOCUMENT v3.8.0.1

Goodwill and Intangible Assets - Additional Information (Detail) - USD ($) $ in Millions	Dec. 31, 2017	Jun. 30, 2017
Goodwill And Intangible Assets [Line Items]
Goodwill	$ 319.4	$ 316.1
Diagnostics [Member]
Goodwill And Intangible Assets [Line Items]
Goodwill	253.3
Other [Member]
Goodwill And Intangible Assets [Line Items]
Goodwill	$ 66.1

X

- Definition

Goodwill and intangible assets.

+ References

No definition available.

+ Details

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

X

- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975

+ Details

Name:	us-gaap_Goodwill
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=mygn_DiagnosticsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=us-gaap_AllOtherSegmentsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: