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Accounts Receivable Sale Program (Narrative) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Receivables [Abstract]
Maximum Limit Accounts Receivable Sale Program	$ 120,000,000.0
Trade Accounts Receivable Sold	305,800,000	$ 284,000,000.0	$ 160,000,000.0
Amount Received From Trade Accounts Receivable Sold To Third Party	$ 305,200,000	$ 283,200,000	$ 159,500,000

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