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Debt - Schedule of Terms and Carrying Value of Debt Instrument (Detail) (USD $)
In Millions, unless otherwise specified
6 Months Ended 0 Months Ended
Nov. 30, 2014
Sep. 25, 2013
May 31, 2014
Debt Instrument [Line Items]      
Premium on notes $ 29.8us-gaap_DebtInstrumentUnamortizedPremium   $ 32.5us-gaap_DebtInstrumentUnamortizedPremium
Total debt 5,714.7us-gaap_LongTermDebt   5,720.4us-gaap_LongTermDebt
Asset-based revolving credit facility, 25-Jul-17 [Member] | Revolving Credit Facility [Member]      
Debt Instrument [Line Items]      
Total debt 185.0us-gaap_LongTermDebt
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_DebtInstrumentAxis
= bmet_AssetBackedRevolvingCreditFacilityMember
   
Line of Credit [Member] | Cash flow revolving credit facility, 25-Apr-17 [Member] | Revolving Credit Facility [Member]      
Debt Instrument [Line Items]      
Maturity period of term loan under the credit facility Apr. 25, 2017    
Total debt 0us-gaap_LongTermDebt
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_DebtInstrumentAxis
= bmet_CashFlowRevolvingCreditFacilityTwentyFiveAprilTwoThousandSeventeenMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
  0us-gaap_LongTermDebt
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_DebtInstrumentAxis
= bmet_CashFlowRevolvingCreditFacilityTwentyFiveAprilTwoThousandSeventeenMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
Line of Credit [Member] | Cash flow revolving credit facility, 25-Apr-17 [Member] | Revolving Credit Facility [Member] | LIBOR [Member]      
Debt Instrument [Line Items]      
Debt instruments basis spread on variable rate 3.50%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_DebtInstrumentAxis
= bmet_CashFlowRevolvingCreditFacilityTwentyFiveAprilTwoThousandSeventeenMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember
   
Line of Credit [Member] | Asset-based revolving credit facility, 25-Jul-17 [Member] | Revolving Credit Facility [Member]      
Debt Instrument [Line Items]      
Maturity period of term loan under the credit facility Jul. 25, 2017    
Total debt 185.0us-gaap_LongTermDebt
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_DebtInstrumentAxis
= bmet_AssetBackedRevolvingCreditFacilityMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
  0us-gaap_LongTermDebt
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_DebtInstrumentAxis
= bmet_AssetBackedRevolvingCreditFacilityMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
Line of Credit [Member] | Asset-based revolving credit facility, 25-Jul-17 [Member] | Revolving Credit Facility [Member] | LIBOR [Member]      
Debt Instrument [Line Items]      
Debt instruments basis spread on variable rate 2.00%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_DebtInstrumentAxis
= bmet_AssetBackedRevolvingCreditFacilityMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember
   
Senior notes [Member] | 6.500% senior notes due 2020 [Member]      
Debt Instrument [Line Items]      
Maturity period of term loan under the credit facility Aug. 01, 2020    
Interest rate 6.50%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= bmet_SixPointFiveZeroSeniorNotesDueTwoThousandTwentyMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
   
Total debt 1,825.0us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= bmet_SixPointFiveZeroSeniorNotesDueTwoThousandTwentyMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
  1,825.0us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= bmet_SixPointFiveZeroSeniorNotesDueTwoThousandTwentyMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
Senior Subordinated Notes [Member] | 6.500% senior notes due 2020 [Member]      
Debt Instrument [Line Items]      
Interest rate 6.50%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= bmet_SixPointFiveZeroSeniorNotesDueTwoThousandTwentyMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorSubordinatedNotesMember
   
Senior Subordinated Notes [Member] | 6.500% senior subordinated notes due 2020 [Member]      
Debt Instrument [Line Items]      
Maturity period of term loan under the credit facility Oct. 01, 2020    
Interest rate 6.50%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= bmet_SixPointFiveZeroSeniorSubordinatedNotesDueTwoThousandTwentyMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorSubordinatedNotesMember
   
Total debt 800.0us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= bmet_SixPointFiveZeroSeniorSubordinatedNotesDueTwoThousandTwentyMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorSubordinatedNotesMember
  800.0us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= bmet_SixPointFiveZeroSeniorSubordinatedNotesDueTwoThousandTwentyMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorSubordinatedNotesMember
USD [Member] | Term Loan [Member] | LIBOR [Member]
     
Debt Instrument [Line Items]      
Debt instruments basis spread on variable rate   3.50%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_CurrencyAxis
= currency_USD
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LoansPayableMember
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember
 
USD [Member] | Term Loan [Member] | Term loan facility, 25-Mar-15 [Member]
     
Debt Instrument [Line Items]      
Maturity period of term loan under the credit facility Mar. 25, 2015    
Total debt 102.7us-gaap_LongTermDebt
/ us-gaap_CurrencyAxis
= currency_USD
/ us-gaap_DebtInstrumentAxis
= bmet_TermLoanFacilityExpiresTwentyFiveMarchTwoThousandFifteenMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LoansPayableMember
  103.3us-gaap_LongTermDebt
/ us-gaap_CurrencyAxis
= currency_USD
/ us-gaap_DebtInstrumentAxis
= bmet_TermLoanFacilityExpiresTwentyFiveMarchTwoThousandFifteenMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LoansPayableMember
USD [Member] | Term Loan [Member] | Term loan facility, 25-Mar-15 [Member] | LIBOR [Member]
     
Debt Instrument [Line Items]      
Debt instruments basis spread on variable rate 3.00%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_CurrencyAxis
= currency_USD
/ us-gaap_DebtInstrumentAxis
= bmet_TermLoanFacilityExpiresTwentyFiveMarchTwoThousandFifteenMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LoansPayableMember
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember
   
USD [Member] | Term Loan [Member] | Term loan facility, 25-Jul-17 [Member]
     
Debt Instrument [Line Items]      
Maturity period of term loan under the credit facility Jul. 25, 2017    
Total debt $ 2,772.2us-gaap_LongTermDebt
/ us-gaap_CurrencyAxis
= currency_USD
/ us-gaap_DebtInstrumentAxis
= bmet_TermLoanFacilityExpiresTwentyFiveJulyTwoThousandSeventeenMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LoansPayableMember
  $ 2,959.6us-gaap_LongTermDebt
/ us-gaap_CurrencyAxis
= currency_USD
/ us-gaap_DebtInstrumentAxis
= bmet_TermLoanFacilityExpiresTwentyFiveJulyTwoThousandSeventeenMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LoansPayableMember
USD [Member] | Term Loan [Member] | Term loan facility, 25-Jul-17 [Member] | LIBOR [Member]
     
Debt Instrument [Line Items]      
Debt instruments basis spread on variable rate 3.50%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_CurrencyAxis
= currency_USD
/ us-gaap_DebtInstrumentAxis
= bmet_TermLoanFacilityExpiresTwentyFiveJulyTwoThousandSeventeenMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LoansPayableMember
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember