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Acquisition - Allocation of Consideration Transferred (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Jun. 30, 2014
Feb. 27, 2015
Business Acquisition [Line Items]      
Goodwill $ 185,228us-gaap_Goodwill $ 169,181us-gaap_Goodwill  
German Clinic [Member]      
Business Acquisition [Line Items]      
Current assets     3,078us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssets
/ us-gaap_BusinessAcquisitionAxis
= mygn_GermanClinicMember
Real property     20,715us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLand
/ us-gaap_BusinessAcquisitionAxis
= mygn_GermanClinicMember
Equipment     1,625us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedEquipment
/ us-gaap_BusinessAcquisitionAxis
= mygn_GermanClinicMember
Other assets     43us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets
/ us-gaap_BusinessAcquisitionAxis
= mygn_GermanClinicMember
Goodwill     16,576us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= mygn_GermanClinicMember
Current liabilities     (4,412)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilities
/ us-gaap_BusinessAcquisitionAxis
= mygn_GermanClinicMember
Long-term liabilities     (6,672)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesLongTermDebt
/ us-gaap_BusinessAcquisitionAxis
= mygn_GermanClinicMember
Deferred grants     (10,838)mygn_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesDeferredRevenue
/ us-gaap_BusinessAcquisitionAxis
= mygn_GermanClinicMember
Total purchase price     $ 20,115us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet
/ us-gaap_BusinessAcquisitionAxis
= mygn_GermanClinicMember