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Capital Management - Summary of Capitalization and Ratio (Detail) - CAD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Jan. 01, 2023
Disclosure Of Capitalisation [Abstract]      
Long-term debt $ 812,469 $ 914,830 $ 1,085,970
Equity attributable to shareholders 1,677,472 1,575,662 $ 1,230,529
Total capitalization $ 2,489,941 $ 2,490,492  
Long-term debt to long-term debt plus equity ratio 0.33% 0.37%