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v3.22.1

Leases - Narrative (Details) $ in Millions | Mar. 31, 2022 USD ($)
--- | ---
Operating Leased Assets [Line Items] |
Lessee, Operating Lease, Liability, Aggregate Annual Minimum Payments | $ 3.0
Minimum [Member] |
Operating Leased Assets [Line Items] |
LeaseExpirationYear | 2028
Maximum [Member] |
Operating Leased Assets [Line Items] |
LeaseExpirationYear | 2032

X
- Definition Year which lease or group of leases is set to expire. + References No definition available. + Details
Name: | bhe_Leaseexpirationyear
Namespace Prefix: | bhe_
Data Type: | xbrli:gYearItemType
Balance Type: | na
Period Type: | instant

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

X
- 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

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |