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Accrued Expenses (Details) (USD $)
In Thousands, unless otherwise specified
6 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Accrued expenses [Abstract]    
Sales commissions $ 3,017us-gaap_AccruedSalesCommissionCurrent $ 1,431us-gaap_AccruedSalesCommissionCurrent
Subcontracting labor 2,217belfb_AccruedSubcontractingLabor 2,406belfb_AccruedSubcontractingLabor
Salaries, bonuses and related benefits 17,964us-gaap_EmployeeRelatedLiabilitiesCurrent 13,674us-gaap_EmployeeRelatedLiabilitiesCurrent
Warranty accrual 6,032us-gaap_ProductWarrantyAccrualClassifiedCurrent 0us-gaap_ProductWarrantyAccrualClassifiedCurrent
Litigation reserve 0us-gaap_LitigationReserveCurrent 723us-gaap_LitigationReserveCurrent
Other 13,358us-gaap_OtherAccruedLiabilitiesCurrent 4,208us-gaap_OtherAccruedLiabilitiesCurrent
Accrued expenses 42,588us-gaap_AccruedLiabilitiesCurrent 22,442us-gaap_AccruedLiabilitiesCurrent
Power Solutions [Member]    
Schedule of warranty accrual account for the period from the acquisition date [Roll Forward]    
Beginning balance as of June 19, 2014 0us-gaap_StandardProductWarrantyAccrual
/ us-gaap_BusinessAcquisitionAxis
= belfb_PowerSolutionsMember
 
Warranty accruals acquired in 2014 Acquisitions 4,397us-gaap_StandardProductWarrantyAccrualAdditionsFromBusinessAcquisition
/ us-gaap_BusinessAcquisitionAxis
= belfb_PowerSolutionsMember
 
Charges and costs accrued 3,834belfb_StandardProductWarrantyAccrualChargesAndCostsAccrued
/ us-gaap_BusinessAcquisitionAxis
= belfb_PowerSolutionsMember
 
Adjustments related to pre-existing warranties (including changes in estimates) (66)belfb_StandardProductWarrantyAccrualAdjustmentsRelatedToPreExistingWarrantiesIncludingChangesInEstimates
/ us-gaap_BusinessAcquisitionAxis
= belfb_PowerSolutionsMember
 
Less repair costs incurred (2,061)us-gaap_StandardProductWarrantyAccrualPayments
/ us-gaap_BusinessAcquisitionAxis
= belfb_PowerSolutionsMember
 
Currency translation (72)us-gaap_StandardProductWarrantyAccrualCurrencyTranslationIncreaseDecrease
/ us-gaap_BusinessAcquisitionAxis
= belfb_PowerSolutionsMember
 
Ending balance as of December 31, 2014 $ 6,032us-gaap_StandardProductWarrantyAccrual
/ us-gaap_BusinessAcquisitionAxis
= belfb_PowerSolutionsMember