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Basis Of Presentation (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2011
Basis Of Presentation [Abstract]
Correction of immaterial errors, increase in cost of goods sold	$ 0.8
Correction of immaterial errors, decrease in net income	$ 0.8
Correction of immaterial errors, decrease in net income per diluted share	$ 0.01

X

- Definition

Correction of an immaterial error, decrease in net income.

+ References

No definition available.

+ Details

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Namespace Prefix:	bhe_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Correction of an immaterial error, decrease in net income per share diluted.

+ References

No definition available.

+ Details

Name:	bhe_CorrectionOfImmaterialErrorDecreaseInNetIncomePerShareDiluted
Namespace Prefix:	bhe_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Correction of an immaterial error, increase in cost of goods sold

+ References

No definition available.

+ Details

Name:	bhe_CorrectionOfImmaterialErrorIncreaseInCostOfGoodsSold
Namespace Prefix:	bhe_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Details

Name:	us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration