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Financing (Long-Term Debt Narratives) (Details) (USD $)
9 Months Ended 3 Months Ended
Mar. 31, 2015
Jun. 30, 2014
Mar. 31, 2015
Sep. 30, 2014
Oct. 01, 2014
Line of Credit Facility [Line Items]          
Credit agreement distributions allowable, amount $ 2,000,000mbuu_CreditAgreementDistributionsAllowableAmount        
Amount available for dividend distribution without affecting capital adequacy requirements 4,000,000us-gaap_AmountAvailableForDividendDistributionWithoutAffectingCapitalAdequacyRequirements   4,000,000us-gaap_AmountAvailableForDividendDistributionWithoutAffectingCapitalAdequacyRequirements    
Less current maturities 0us-gaap_LongTermDebtCurrent 0us-gaap_LongTermDebtCurrent 0us-gaap_LongTermDebtCurrent    
Total debt less current maturities 10,000,000us-gaap_LongTermDebtNoncurrent 0us-gaap_LongTermDebtNoncurrent 10,000,000us-gaap_LongTermDebtNoncurrent    
Revolving Credit Facility [Member]          
Line of Credit Facility [Line Items]          
Maximum borrowing capacity       10,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
 
Term Loan [Member]          
Line of Credit Facility [Line Items]          
Extinguishment of Debt, Amount   65,000,000us-gaap_ExtinguishmentOfDebtAmount
/ us-gaap_CreditFacilityAxis
= us-gaap_SecuredDebtMember
     
Letter of Credit [Member]          
Line of Credit Facility [Line Items]          
Maximum borrowing capacity 3,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_LetterOfCreditMember
  3,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_LetterOfCreditMember
   
Amount outstanding 0us-gaap_LineOfCredit
/ us-gaap_CreditFacilityAxis
= us-gaap_LetterOfCreditMember
  0us-gaap_LineOfCredit
/ us-gaap_CreditFacilityAxis
= us-gaap_LetterOfCreditMember
   
Swing Line of Credit [Member]          
Line of Credit Facility [Line Items]          
Maximum borrowing capacity 2,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= mbuu_SwingLineofCreditMember
  2,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= mbuu_SwingLineofCreditMember
   
Amount outstanding 0us-gaap_LineOfCredit
/ us-gaap_CreditFacilityAxis
= mbuu_SwingLineofCreditMember
  0us-gaap_LineOfCredit
/ us-gaap_CreditFacilityAxis
= mbuu_SwingLineofCreditMember
   
Minimum [Member] | London Interbank Offered Rate (LIBOR) [Member] | Revolving Credit Facility [Member]          
Line of Credit Facility [Line Items]          
Debt Instrument, Basis Spread on Variable Rate     2.50%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember
   
Minimum [Member] | Base Rate [Member] | Revolving Credit Facility [Member]          
Line of Credit Facility [Line Items]          
Debt Instrument, Basis Spread on Variable Rate     1.50%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_VariableRateAxis
= us-gaap_BaseRateMember
   
Maximum [Member] | London Interbank Offered Rate (LIBOR) [Member] | Revolving Credit Facility [Member]          
Line of Credit Facility [Line Items]          
Debt Instrument, Basis Spread on Variable Rate     3.25%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember
   
Maximum [Member] | Base Rate [Member] | Revolving Credit Facility [Member]          
Line of Credit Facility [Line Items]          
Debt Instrument, Basis Spread on Variable Rate     2.25%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_VariableRateAxis
= us-gaap_BaseRateMember
   
Line of Credit [Member] | Revolving Credit Facility [Member]          
Line of Credit Facility [Line Items]          
Maximum borrowing capacity       30,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
30,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
Line of credit facility, current borrowing capacity         $ 10,000,000mbuu_LineofCreditFacilityFutureBorrowingIncreaseLimit
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember