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v2.4.1.9

Accrued Expenses (Details) (USD $) In Thousands, unless otherwise specified | 6 Months Ended |
--- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013
Accrued expenses [Abstract] |  |
Sales commissions | $ 3,017 us-gaap_AccruedSalesCommissionCurrent | $ 1,431 us-gaap_AccruedSalesCommissionCurrent
Subcontracting labor | 2,217 belfb_AccruedSubcontractingLabor | 2,406 belfb_AccruedSubcontractingLabor
Salaries, bonuses and related benefits | 17,964 us-gaap_EmployeeRelatedLiabilitiesCurrent | 13,674 us-gaap_EmployeeRelatedLiabilitiesCurrent
Warranty accrual | 6,032 us-gaap_ProductWarrantyAccrualClassifiedCurrent | 0 us-gaap_ProductWarrantyAccrualClassifiedCurrent
Litigation reserve | 0 us-gaap_LitigationReserveCurrent | 723 us-gaap_LitigationReserveCurrent
Other | 13,358 us-gaap_OtherAccruedLiabilitiesCurrent | 4,208 us-gaap_OtherAccruedLiabilitiesCurrent
Accrued expenses | 42,588 us-gaap_AccruedLiabilitiesCurrent | 22,442 us-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 | 0 us-gaap_StandardProductWarrantyAccrual / us-gaap_BusinessAcquisitionAxis = belfb_PowerSolutionsMember |
Warranty accruals acquired in 2014 Acquisitions | 4,397 us-gaap_StandardProductWarrantyAccrualAdditionsFromBusinessAcquisition / us-gaap_BusinessAcquisitionAxis = belfb_PowerSolutionsMember |
Charges and costs accrued | 3,834 belfb_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 | $ 6,032 us-gaap_StandardProductWarrantyAccrual / us-gaap_BusinessAcquisitionAxis = belfb_PowerSolutionsMember |

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