Name:	bhe_AccumulatedOtherComprehensiveIncomeLossNetCummulativeNetGainLossFromCashFlowHedgesEffectBeforeTaxes
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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

No definition available.

Name:	bhe_AccumulatedOtherComprehensiveIncomeLossNetDerivativesRollForward
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The amount of net gains or losses on a cash flow hedge reclassified from accumulated other comprehensive income.

No definition available.

Name:	bhe_CashFlowHedgeGainLossNetReclassifiedtoRevenue
Namespace Prefix:	bhe_
Data Type:	xbrli:monetaryItemType
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Period Type:	duration

The amount of net gains or losses on a cash flow hedge reclassified in the period to cost of sales from accumulated other comprehensive income.

No definition available.

Name:	bhe_CashFlowHedgeGainLossReclassifiedtoCostofSales
Namespace Prefix:	bhe_
Data Type:	xbrli:monetaryItemType
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Period Type:	duration

The estimated net amount of existing gains or losses on cash flow hedges at the reporting date expected to be reclassified to earnings within the next 12 months.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=35736893&loc=d3e80748-113994

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A disclosure of an assertion that the amount of cash flow hedge ineffectiveness is immaterial.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4C
-Subparagraph (d)(1)
-URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959

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The effective portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments that was recognized in other comprehensive income during the current period.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4C
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959