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Commitments and contingencies - Estimates of Future Commitments (Detail) $ in Thousands | Aug. 06, 2021 MWac | Jun. 30, 2021 USD ($)
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Commitments Disclosure [Line Items] |  |
Year 1 |  | $ 309,109
Year 2 |  | 157,345
Year 3 |  | 145,423
Year 4 |  | 140,702
Year 5 |  | 116,504
Thereafter |  | 1,156,161
Total |  | 2,025,244
Power purchase |  |
Commitments Disclosure [Line Items] |  |
Year 1 |  | 48,177
Year 2 |  | 27,767
Year 3 |  | 27,101
Year 4 |  | 27,334
Year 5 |  | 19,631
Thereafter |  | 161,284
Total |  | 311,294
Gas supply and service agreements |  |
Commitments Disclosure [Line Items] |  |
Year 1 |  | 78,929
Year 2 |  | 58,768
Year 3 |  | 46,774
Year 4 |  | 43,862
Year 5 |  | 29,650
Thereafter |  | 146,039
Total |  | 404,022
Service agreements |  |
Commitments Disclosure [Line Items] |  |
Year 1 |  | 62,055
Year 2 |  | 57,813
Year 3 |  | 58,377
Year 4 |  | 56,163
Year 5 |  | 53,706
Thereafter |  | 369,283
Total |  | 657,397
Capital projects |  |
Commitments Disclosure [Line Items] |  |
Year 1 |  | 107,001
Year 2 |  | 0
Year 3 |  | 0
Year 4 |  | 0
Year 5 |  | 0
Thereafter |  | 0
Total |  | 107,001
Land easements |  |
Commitments Disclosure [Line Items] |  |
Year 1 |  | 12,947
Year 2 |  | 12,997
Year 3 |  | 13,171
Year 4 |  | 13,343
Year 5 |  | 13,517
Thereafter |  | 479,555
Total |  | $ 545,530
Gaia Power Inc. vs APUC | Amherst Island Wind Facility | Subsequent Event |  |
Commitments Disclosure [Line Items] |  |
Wind power capacity (megawatt AC) | MWac | 74 |
Gaia Power Inc. vs APUC | Blue Hill Wind Project | Subsequent Event |  |
Commitments Disclosure [Line Items] |  |
Wind power capacity (megawatt AC) | MWac | 175 |

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