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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)

X

- Definition

Amount classified as goodwill attributable to disposal group held for sale or disposed of.

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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