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Commitments and contingencies - Estimates of Future Commitments (Detail)
$ in Thousands, $ in Thousands
Oct. 30, 2018
CAD ($)
Jun. 30, 2019
USD ($)
Commitments Disclosure [Line Items]    
Year 1   $ 238,786
Year 2   157,217
Year 3   83,915
Year 4   85,148
Year 5   83,511
Thereafter   745,078
Total   1,393,655
Power purchase    
Commitments Disclosure [Line Items]    
Year 1   32,904
Year 2   11,004
Year 3   11,225
Year 4   11,452
Year 5   11,680
Thereafter   185,349
Total   263,614
Gas supply and service agreements    
Commitments Disclosure [Line Items]    
Year 1   68,216
Year 2   41,036
Year 3   26,969
Year 4   25,109
Year 5   20,279
Thereafter   39,648
Total   221,257
Service agreements    
Commitments Disclosure [Line Items]    
Year 1   47,206
Year 2   39,575
Year 3   39,025
Year 4   41,813
Year 5   44,685
Thereafter   316,099
Total   528,403
Capital projects    
Commitments Disclosure [Line Items]    
Year 1   83,990
Year 2   58,976
Year 3   0
Year 4   0
Year 5   0
Thereafter   0
Total   142,966
Land easements (note 1(c))    
Commitments Disclosure [Line Items]    
Year 1   6,470
Year 2   6,626
Year 3   6,696
Year 4   6,774
Year 5   6,867
Thereafter   203,982
Total   $ 237,415
Gaia Power Inc. vs APUC    
Commitments Disclosure [Line Items]    
Damages sought $ 345,000  
Puntitive damages sought $ 25,000