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Ransomware incident (Narrative) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Disclosure Text Block Supplement [Abstract] |  |  |
Ransomware related incident costs, net | $ 0 | $ 0 | $ (3,944)

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- Definition The amount of costs (recovery) associated with systems affected by a ransomware incident that encrypted information on our systems and disrupted customer and employee access to our systems and services. + References No definition available. + Details
Name: | bhe_RansomwareRelatedIncidentCostsNet
Namespace Prefix: | bhe_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_DisclosureTextBlockSupplementAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration