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Goodwill - Changes in Carrying Amount of Goodwill (Details) - CAD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2022
Dec. 31, 2022
Mar. 31, 2022
Goodwill [Line Items]      
Beginning Balance   $ 1,866,503 $ 1,889,354
Purchase accounting allocations     105,323
Impairment losses $ (2,311) (1,727,679) (40,748)
Foreign currency translation adjustments   3,479 (28,640)
Ending Balance   142,076 1,866,503
Consolidated Entities      
Goodwill [Line Items]      
Disposal of consolidated entities   $ (227) $ (58,786)