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Preliminary Estimated Fair Values of the Assets Acquired and Liabilities Assumed (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Mar. 31, 2014
Jul. 01, 2014
Acquired assets:      
Goodwill $ 35,327us-gaap_Goodwill $ 37,990us-gaap_Goodwill  
Long-term deferred tax assets 778us-gaap_DeferredTaxAssetsLiabilitiesNetNoncurrent    
ECP      
Acquired assets:      
Cash and cash equivalents     53us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents
/ us-gaap_BusinessAcquisitionAxis
= abmd_EcpMember
Accounts receivable     25us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables
/ us-gaap_BusinessAcquisitionAxis
= abmd_EcpMember
Property and equipment     619us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment
/ us-gaap_BusinessAcquisitionAxis
= abmd_EcpMember
In-process research and development     18,500us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIndefiniteLivedIntangibleAssets
/ us-gaap_BusinessAcquisitionAxis
= abmd_EcpMember
Goodwill     1,964us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= abmd_EcpMember
Long-term deferred tax assets     874us-gaap_DeferredTaxAssetsLiabilitiesNetNoncurrent
/ us-gaap_BusinessAcquisitionAxis
= abmd_EcpMember
Other assets acquired     141us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets
/ us-gaap_BusinessAcquisitionAxis
= abmd_EcpMember
Total assets acquired     22,176us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets
/ us-gaap_BusinessAcquisitionAxis
= abmd_EcpMember
Liabilities assumed:      
Accounts payable     295us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccountsPayable
/ us-gaap_BusinessAcquisitionAxis
= abmd_EcpMember
Accrued liabilities     131abmd_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAccruedLiabilities
/ us-gaap_BusinessAcquisitionAxis
= abmd_EcpMember
Total liabilities assumed     426us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities
/ us-gaap_BusinessAcquisitionAxis
= abmd_EcpMember
Net assets acquired     $ 21,750us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet
/ us-gaap_BusinessAcquisitionAxis
= abmd_EcpMember