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Goodwill - Changes in Carrying Amount of Goodwill (Details) - CAD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Jun. 30, 2026
Mar. 31, 2026
Goodwill [Line Items]    
Beginning Balance $ 55,685 $ 46,042
Purchase accounting allocations   55,685
Impairment losses   (47,491)
Foreign currency translation adjustments 0 1,449
Ending Balance $ 55,685 $ 55,685