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Goodwill And Other Intangible Assets (Narrative) (Details) | 3 Months Ended
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Mar. 31, 2018
Minimum [Member] | Customer Relationships [Member] |
Goodwill And Other Intangible Assets [Line Items] |
Estimated useful life | 10 years
Minimum [Member] | Purchased Software Costs [Member] |
Goodwill And Other Intangible Assets [Line Items] |
Estimated useful life | 2 years
Maximum [Member] | Customer Relationships [Member] |
Goodwill And Other Intangible Assets [Line Items] |
Estimated useful life | 14 years
Maximum [Member] | Purchased Software Costs [Member] |
Goodwill And Other Intangible Assets [Line Items] |
Estimated useful life | 10 years

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- Definition Goodwill And Other Intangible Assets [Line Items] + References No definition available. + Details
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Namespace Prefix: | bhe_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
Name: | us-gaap_FiniteLivedIntangibleAssetUsefulLife
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |