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Recent Acquisitions by Biomet - Purchase Price Allocation (Detail) (USD $)
In Millions, unless otherwise specified
Nov. 30, 2014
May 31, 2014
Oct. 05, 2013
Business Acquisition [Line Items]      
Goodwill $ 3,577.1us-gaap_Goodwill $ 3,634.4us-gaap_Goodwill  
Lanx, Inc. [Member]      
Business Acquisition [Line Items]      
Cash     2.0us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents
/ us-gaap_BusinessAcquisitionAxis
= bmet_LanxInc.Member
Accounts receivable     16.5us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables
/ us-gaap_BusinessAcquisitionAxis
= bmet_LanxInc.Member
Inventory     24.8us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory
/ us-gaap_BusinessAcquisitionAxis
= bmet_LanxInc.Member
Prepaid expenses and other     11.0us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsPrepaidExpenseAndOtherAssets
/ us-gaap_BusinessAcquisitionAxis
= bmet_LanxInc.Member
Instruments     9.9bmet_Businessacquisitionpurchasepriceallocationfinancialinstrumentsowned
/ us-gaap_BusinessAcquisitionAxis
= bmet_LanxInc.Member
Other property, plant and equipment     2.1us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment
/ us-gaap_BusinessAcquisitionAxis
= bmet_LanxInc.Member
Deferred tax liability     (36.8)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiabilitiesNoncurrent
/ us-gaap_BusinessAcquisitionAxis
= bmet_LanxInc.Member
Other liabilities assumed     (20.7)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther
/ us-gaap_BusinessAcquisitionAxis
= bmet_LanxInc.Member
Intangible assets     102.3us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill
/ us-gaap_BusinessAcquisitionAxis
= bmet_LanxInc.Member
Goodwill     39.7us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= bmet_LanxInc.Member
Preliminary purchase price     $ 150.8us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet
/ us-gaap_BusinessAcquisitionAxis
= bmet_LanxInc.Member