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Goodwill and Intangible Assets - Summarized Amounts Reported as Intangible Assets (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Jun. 30, 2014
Intangible Assets [Line Items]
Gross Carrying Amount, total intangible assets	$ 211,550us-gaap_IntangibleAssetsGrossExcludingGoodwill	$ 213,550us-gaap_IntangibleAssetsGrossExcludingGoodwill
Accumulated Amortization	(12,723)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization	(8,238)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
Net, total intangible assets	198,827us-gaap_IntangibleAssetsNetExcludingGoodwill	205,312us-gaap_IntangibleAssetsNetExcludingGoodwill
Gross Carrying Amount, non-amortizable intangible assets	4,800mygn_IndefiniteLivedIntangibleAssetsGrossExcludingGoodwill	4,800mygn_IndefiniteLivedIntangibleAssetsGrossExcludingGoodwill
Accumulated Amortization, non-amortizable intangible assets
Net, non-amortizable intangible assets	4,800us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill	4,800us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill
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	(10,750)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = mygn_PurchasedLicensesAndTechnologiesMember	(6,597)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = mygn_PurchasedLicensesAndTechnologiesMember
Net, amortizable intangible assets	188,350us-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	(1,673)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember	(1,441)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember
Net, amortizable intangible assets	2,977us-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 = mygn_TrademarkMember	3,000us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = mygn_TrademarkMember
Accumulated Amortization	(300)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = mygn_TrademarkMember	(200)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = mygn_TrademarkMember
Net, amortizable intangible assets	2,700us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = mygn_TrademarkMember	2,800us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = mygn_TrademarkMember
Total amortized intangible assets
Intangible Assets [Line Items]
Gross Carrying Amount, amortizable intangible assets	206,750us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = mygn_TotalAmortizedIntangibleAssetsMember	208,750us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = mygn_TotalAmortizedIntangibleAssetsMember
Accumulated Amortization	(12,723)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = mygn_TotalAmortizedIntangibleAssetsMember	(8,238)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = mygn_TotalAmortizedIntangibleAssetsMember
Net, amortizable intangible assets	194,027us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = mygn_TotalAmortizedIntangibleAssetsMember	200,512us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = mygn_TotalAmortizedIntangibleAssetsMember
In-Process Research And Development
Intangible Assets [Line Items]
Gross Carrying Amount, non-amortizable intangible assets	4,800mygn_IndefiniteLivedIntangibleAssetsGrossExcludingGoodwill / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_InProcessResearchAndDevelopmentMember	4,800mygn_IndefiniteLivedIntangibleAssetsGrossExcludingGoodwill / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_InProcessResearchAndDevelopmentMember
Accumulated Amortization, non-amortizable intangible assets
Net, non-amortizable intangible assets	$ 4,800us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_InProcessResearchAndDevelopmentMember	$ 4,800us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_InProcessResearchAndDevelopmentMember

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