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Segmented information - Disclosure of revenue information by location (Details) - CAD ($)
 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Disclosure of geographical areas [line items]    
Revenue $ 15,912,673,000 $ 14,676,152,000
Western and Southern Europe    
Disclosure of geographical areas [line items]    
Revenue, including intersegment sales 2,621,250,000 2,548,856,000
Revenue 2,679,167,000 2,600,198,000
Western and Southern Europe | France    
Disclosure of geographical areas [line items]    
Revenue, including intersegment sales 2,293,714,000 2,253,580,000
Western and Southern Europe | Portugal    
Disclosure of geographical areas [line items]    
Revenue, including intersegment sales 131,043,000 120,471,000
Western and Southern Europe | Spain    
Disclosure of geographical areas [line items]    
Revenue, including intersegment sales 130,478,000 118,693,000
Western and Southern Europe | Others    
Disclosure of geographical areas [line items]    
Revenue, including intersegment sales 66,015,000 56,112,000
U.S. | U.S.    
Disclosure of geographical areas [line items]    
Revenue, including intersegment sales 5,063,038,000 4,574,294,000
U.S. Commercial and State Government    
Disclosure of geographical areas [line items]    
Revenue 2,522,956,000 2,327,309,000
U.S. Commercial and State Government | U.S.    
Disclosure of geographical areas [line items]    
Revenue, including intersegment sales 2,809,549,000 2,564,710,000
U.S. Federal    
Disclosure of geographical areas [line items]    
Revenue 2,247,943,000 2,001,391,000
U.S. Federal | U.S.    
Disclosure of geographical areas [line items]    
Revenue, including intersegment sales 2,253,489,000 2,009,584,000
Canada    
Disclosure of geographical areas [line items]    
Revenue 2,090,682,000 2,034,995,000
Canada | Canada    
Disclosure of geographical areas [line items]    
Revenue, including intersegment sales 2,302,236,000 2,208,938,000
Scandinavia, Northwest and Central- East Europe    
Disclosure of geographical areas [line items]    
Revenue, including intersegment sales 1,751,919,000 1,670,332,000
Revenue 1,688,887,000 1,593,434,000
Scandinavia, Northwest and Central- East Europe | Others    
Disclosure of geographical areas [line items]    
Revenue, including intersegment sales 70,637,000 65,789,000
Scandinavia, Northwest and Central- East Europe | Sweden    
Disclosure of geographical areas [line items]    
Revenue, including intersegment sales 713,513,000 692,192,000
Scandinavia, Northwest and Central- East Europe | Netherlands    
Disclosure of geographical areas [line items]    
Revenue, including intersegment sales 678,664,000 633,337,000
Scandinavia, Northwest and Central- East Europe | Norway    
Disclosure of geographical areas [line items]    
Revenue, including intersegment sales 111,134,000 110,025,000
Scandinavia, Northwest and Central- East Europe | Denmark    
Disclosure of geographical areas [line items]    
Revenue, including intersegment sales 96,256,000 89,852,000
Scandinavia, Northwest and Central- East Europe | Czech Republic    
Disclosure of geographical areas [line items]    
Revenue, including intersegment sales 81,715,000 79,137,000
U.K. and Australia    
Disclosure of geographical areas [line items]    
Revenue, including intersegment sales 2,225,932,000 1,793,966,000
Revenue 2,020,016,000 1,584,833,000
U.K. and Australia | U.K.    
Disclosure of geographical areas [line items]    
Revenue, including intersegment sales 2,144,523,000 1,722,485,000
U.K. and Australia | Australia    
Disclosure of geographical areas [line items]    
Revenue, including intersegment sales 81,409,000 71,481,000
Germany    
Disclosure of geographical areas [line items]    
Revenue 901,609,000 894,565,000
Germany | GERMANY    
Disclosure of geographical areas [line items]    
Revenue, including intersegment sales 980,807,000 959,129,000
Finland, Poland and Baltics    
Disclosure of geographical areas [line items]    
Revenue, including intersegment sales 962,845,000 913,523,000
Revenue 903,701,000 859,263,000
Finland, Poland and Baltics | Others    
Disclosure of geographical areas [line items]    
Revenue, including intersegment sales 79,697,000 70,958,000
Finland, Poland and Baltics | Finland    
Disclosure of geographical areas [line items]    
Revenue, including intersegment sales 883,148,000 842,565,000
Asia Pacific    
Disclosure of geographical areas [line items]    
Revenue, including intersegment sales 4,646,000 7,114,000
Revenue 1,014,441,000 956,145,000
Asia Pacific | Others    
Disclosure of geographical areas [line items]    
Revenue, including intersegment sales $ 4,646,000 $ 7,114,000