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Accounts Receivable Sale Program (Narrative) (Details) - USD ($) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Receivables [Abstract] |  |  |  |
Maximum Limit Accounts Receivable Sale Program |  |  | $ 120,000,000.0 |
Trade Accounts Receivable Sold | $ 87,000,000.0 | $ 77,900,000 | 166,300,000 | $ 154,300,000
Amount Received From Trade Accounts Receivable Sold To Third Party | $ 86,800,000 | $ 77,700,000 | $ 166,000,000.0 | $ 154,000,000.0

X
- Definition Amount received upon sale of trade accounts receivable to third party. + References No definition available. + Details
Name: | bhe_AmountReceivedFromTradeAccountsReceivableSoldToThirdParty
Namespace Prefix: | bhe_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Accounts receivable program with third party maximum amount at any time that can be sold. + References No definition available. + Details
Name: | bhe_MaximumLimitAccountsReceivableSaleProgram
Namespace Prefix: | bhe_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents the amount of trade accounts receivable that have been sold to a third party. + References No definition available. + Details
Name: | bhe_TradeAccountsReceivableSold
Namespace Prefix: | bhe_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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