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Goodwill and Intangible Assets - Summarized Amounts Reported as Intangible Assets (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Jun. 30, 2014
Intangible Assets [Line Items]
Gross Carrying Amount, total intangible assets	$ 211,550us-gaap_IntangibleAssetsGrossExcludingGoodwill	$ 213,550us-gaap_IntangibleAssetsGrossExcludingGoodwill
Gross Carrying Amount, amortizable intangible assets	206,750us-gaap_FiniteLivedIntangibleAssetsGross	208,750us-gaap_FiniteLivedIntangibleAssetsGross
Accumulated Amortization	(15,859)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization	(8,238)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
Net, total intangible assets	195,691us-gaap_IntangibleAssetsNetExcludingGoodwill	205,312us-gaap_IntangibleAssetsNetExcludingGoodwill
Net, amortizable intangible assets	190,891us-gaap_FiniteLivedIntangibleAssetsNet	200,512us-gaap_FiniteLivedIntangibleAssetsNet
Net, non-amortizable intangible assets	4,800us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill	4,800us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill
In-Process Research And Development
Intangible Assets [Line Items]
Net, non-amortizable intangible assets	4,800us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = mygn_InProcessResearchAndDevelopmentWithIndefiniteLivesMember	4,800us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = mygn_InProcessResearchAndDevelopmentWithIndefiniteLivesMember
Purchased Licenses And Technologies
Intangible Assets [Line Items]
Gross Carrying Amount, amortizable intangible assets	199,100us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = mygn_PurchasedLicensesAndTechnologiesMember	201,100us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = mygn_PurchasedLicensesAndTechnologiesMember
Accumulated Amortization	(13,719)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = mygn_PurchasedLicensesAndTechnologiesMember	(6,597)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = mygn_PurchasedLicensesAndTechnologiesMember
Net, amortizable intangible assets	185,381us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = mygn_PurchasedLicensesAndTechnologiesMember	194,503us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = mygn_PurchasedLicensesAndTechnologiesMember
Customer Relationships
Intangible Assets [Line Items]
Gross Carrying Amount, amortizable intangible assets	4,650us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember	4,650us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember
Accumulated Amortization	(1,790)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember	(1,441)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember
Net, amortizable intangible assets	2,860us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember	3,209us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember
Trademarks
Intangible Assets [Line Items]
Gross Carrying Amount, amortizable intangible assets	3,000us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TrademarksMember	3,000us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TrademarksMember
Accumulated Amortization	(350)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TrademarksMember	(200)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TrademarksMember
Net, amortizable intangible assets	$ 2,650us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TrademarksMember	$ 2,800us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TrademarksMember

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Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges.

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