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Subsequent Events - Additional Information (Detail) (Subsequent Event [Member], USD $)
0 Months Ended
Jan. 02, 2015
Revolving Credit Facility [Member]
 
Subsequent Event [Line Items]  
Amount borrowed under revolving credit facility $ 200,000,000us-gaap_LineOfCredit
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
Tripwire, Inc. [Member]
 
Subsequent Event [Line Items]  
Acquisition price 710,000,000us-gaap_PaymentsToAcquireBusinessesGross
/ us-gaap_BusinessAcquisitionAxis
= bdc_TripwireIncMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
Tripwire, Inc. [Member] | Revolving Credit Facility [Member]
 
Subsequent Event [Line Items]  
Amount borrowed under revolving credit facility $ 200,000,000us-gaap_LineOfCredit
/ us-gaap_BusinessAcquisitionAxis
= bdc_TripwireIncMember
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember