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Regulatory matters - Approved Annual Revenue Increases (Details) - USD ($) $ in Thousands |  |  | 3 Months Ended
--- | --- | --- | ---
Aug. 01, 2021 | Jun. 01, 2021 | Jun. 30, 2021
BELCO (Bermuda) [Member] |  |  |
Regulatory Liabilities [Line Items] |  |  |
Weighted average cost of capital (percent) |  | 7.50% |
Authorized revenue |  | $ 211,432 |
Deferred earned revenue |  | $ 13,426 |
Deferred revenue, amortization period |  | 5 years |
Energy North Gas System | Subsequent Event |  |  |
Regulatory Liabilities [Line Items] |  |  |
Annual distribution revenue increase (decrease) | $ 1,300 |  |
Approved revenue increase (decrease) | 7,600 |  |
Approved step increase (decrease) | 4,000 |  |
Approved second step increase (decrease) | $ 3,200 |  |
Various |  |  |
Regulatory Liabilities [Line Items] |  |  |
Approved revenue increase (decrease) |  |  | $ 340

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Amortization period for the recovery of regulatory liability, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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