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Ransomware incident (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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Mar. 31, 2022 | Mar. 31, 2021 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Disclosure Text Block Supplement [Abstract] |  |  |  |  |
Ransomware related incident costs, gross |  |  |  |  | $ 12,700
Ransomware related incident costs, net | $ 0 | $ (3,444) |  |  | 7,700
Insurance recoveries |  |  |  |  | $ 5,000
Collection of recorded insurance receivable |  |  |  | $ 6,600 |
Insurance recoveries collected at point in time | $ 0 |  | $ 10,500 |  |
Additional collection of recorded insurance receivable |  |  | $ 3,900 | $ 1,600 |

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- Definition Additional collection of recorded insurance receivable. + References No definition available. + Details
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- Definition Insurance recoveries collected at point in time. + References No definition available. + Details
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- Definition Ransomware related incident costs gross. + References No definition available. + Details
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- Definition The amount of costs (recovery) associated with systems affected by a ransomware incident that encrypted information on our systems and disrupted customer and employee access to our systems and services. + References No definition available. + Details
Name: | bhe_RansomwareRelatedIncidentCostsNet
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- References No definition available. + Details
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- Definition The increase (decrease) during the reporting period in insurance settlements receivable, which are amounts due in settlement of a claim for reimbursement from an insurance company when the Company has suffered a loss covered under an insurance policy. The expectation is that such reimbursement will be received within one year of the balance sheet date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3602-108585 + Details
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- Definition The amount recovered from insurance. These recoveries reduce costs and losses that are reported as a separate line item under operating expenses. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.3) -URI http://asc.fasb.org/extlink&oid=123367319&loc=SL114868664-224227 + Details
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