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v3.23.2

Leases - Narrative (Details) $ in Millions | 6 Months Ended
--- | ---
Jun. 30, 2023 USD ($)
Operating Leased Assets [Line Items] |
Operating lease expiration year | 2034
Lessee, Operating Lease, Liability, Aggregate Annual Minimum Payments | $ 2.7

X
- Definition Lessee, operating lease, liability, aggregate annual minimum payments. + References No definition available. + Details
Name: | bhe_LesseeOperatingLeaseLiabilityAggregateAnnualMinimumPayments
Namespace Prefix: | bhe_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Operating lease expiration year. + References No definition available. + Details
Name: | bhe_OperatingLeaseExpirationYear
Namespace Prefix: | bhe_
Data Type: | xbrli:gYearItemType
Balance Type: | na
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_OperatingLeasedAssetsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration