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Commitments and contingencies - Estimates of Future Commitments (Detail) - USD ($) $ in Thousands | Oct. 30, 2018 | Jun. 30, 2020
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Commitments Disclosure [Line Items] |  |
Year 1 |  | $ 708,205
Year 2 |  | 113,923
Year 3 |  | 111,625
Year 4 |  | 107,737
Year 5 |  | 104,933
Thereafter |  | 767,117
Total |  | 1,913,540
Power purchase |  |
Commitments Disclosure [Line Items] |  |
Year 1 |  | 29,028
Year 2 |  | 11,585
Year 3 |  | 11,506
Year 4 |  | 11,735
Year 5 |  | 11,913
Thereafter |  | 173,436
Total |  | 249,203
Gas supply and service agreements |  |
Commitments Disclosure [Line Items] |  |
Year 1 |  | 78,698
Year 2 |  | 55,000
Year 3 |  | 49,588
Year 4 |  | 42,756
Year 5 |  | 39,758
Thereafter |  | 129,584
Total |  | 395,384
Service agreements |  |
Commitments Disclosure [Line Items] |  |
Year 1 |  | 50,661
Year 2 |  | 40,697
Year 3 |  | 43,813
Year 4 |  | 46,436
Year 5 |  | 46,375
Thereafter |  | 268,663
Total |  | 496,645
Capital projects |  |
Commitments Disclosure [Line Items] |  |
Year 1 |  | 543,211
Year 2 |  | 0
Year 3 |  | 0
Year 4 |  | 0
Year 5 |  | 0
Thereafter |  | 0
Total |  | 543,211
Land easements |  |
Commitments Disclosure [Line Items] |  |
Year 1 |  | 6,607
Year 2 |  | 6,641
Year 3 |  | 6,718
Year 4 |  | 6,810
Year 5 |  | 6,887
Thereafter |  | 195,434
Total |  | $ 229,097
Gaia Power Inc. vs APUC |  |
Commitments Disclosure [Line Items] |  |
Damages claimed by other party in lawsuit | $ 345,000 |
Punitive damages claimed by other party in lawsuit | $ 25,000 |

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