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Accounts Receivable Sale Program (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Accounts Receivable Sale Program [Line Items] |  |  |  |
Maximum Limit Accounts Receivable Sale Program |  |  | $ 80.0 |
Trade Accounts Receivable Sold | $ 40.0 | $ 40.0 | 120.0 | $ 105.0
Amount Received From Trade Accounts Receivable Sold To Third Party | $ 39.9 | $ 39.9 | $ 119.7 | $ 104.8

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

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- 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