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Segmented information - Disclosure of revenue information by location (Details) - CAD ($)
 12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Disclosure of geographical areas [line items]    
Revenue $ 14,676,152,000 $ 14,296,360,000
Western and Southern Europe    
Disclosure of geographical areas [line items]    
Revenue, including intersegment sales 2,548,856,000 2,563,876,000
Revenue 2,600,198,000 2,605,926,000
Western and Southern Europe | France    
Disclosure of geographical areas [line items]    
Revenue, including intersegment sales 2,253,580,000 2,277,088,000
Western and Southern Europe | Portugal    
Disclosure of geographical areas [line items]    
Revenue, including intersegment sales 120,471,000 116,928,000
Western and Southern Europe | Spain    
Disclosure of geographical areas [line items]    
Revenue, including intersegment sales 118,693,000 114,341,000
Western and Southern Europe | Others    
Disclosure of geographical areas [line items]    
Revenue, including intersegment sales 56,112,000 55,519,000
U.S. | U.S.    
Disclosure of geographical areas [line items]    
Revenue, including intersegment sales 4,574,294,000 4,404,982,000
U.S. Commercial and State Government    
Disclosure of geographical areas [line items]    
Revenue 2,327,309,000 2,277,996,000
U.S. Commercial and State Government | U.S.    
Disclosure of geographical areas [line items]    
Revenue, including intersegment sales 2,564,710,000 2,461,366,000
U.S. Federal    
Disclosure of geographical areas [line items]    
Revenue 2,001,391,000 1,935,238,000
U.S. Federal | U.S.    
Disclosure of geographical areas [line items]    
Revenue, including intersegment sales 2,009,584,000 1,943,616,000
Canada    
Disclosure of geographical areas [line items]    
Revenue 2,034,995,000 2,064,659,000
Canada | Canada    
Disclosure of geographical areas [line items]    
Revenue, including intersegment sales 2,208,938,000 2,232,091,000
Scandinavia and Central Europe    
Disclosure of geographical areas [line items]    
Revenue, including intersegment sales 1,761,346,000 1,740,285,000
Revenue 1,658,172,000 1,648,356,000
Scandinavia and Central Europe | Germany    
Disclosure of geographical areas [line items]    
Revenue, including intersegment sales 959,129,000 925,679,000
Scandinavia and Central Europe | Sweden    
Disclosure of geographical areas [line items]    
Revenue, including intersegment sales 692,192,000 691,240,000
Scandinavia and Central Europe | Norway    
Disclosure of geographical areas [line items]    
Revenue, including intersegment sales 110,025,000 123,366,000
U.K. and Australia    
Disclosure of geographical areas [line items]    
Revenue, including intersegment sales 1,793,966,000 1,679,241,000
Revenue 1,584,833,000 1,455,529,000
U.K. and Australia | U.K.    
Disclosure of geographical areas [line items]    
Revenue, including intersegment sales 1,722,485,000 1,588,665,000
U.K. and Australia | Australia    
Disclosure of geographical areas [line items]    
Revenue, including intersegment sales 71,481,000 90,576,000
Finland, Poland and Baltics    
Disclosure of geographical areas [line items]    
Revenue, including intersegment sales 913,523,000 870,450,000
Revenue 859,263,000 828,951,000
Finland, Poland and Baltics | Others    
Disclosure of geographical areas [line items]    
Revenue, including intersegment sales 70,958,000 49,564,000
Finland, Poland and Baltics | Finland    
Disclosure of geographical areas [line items]    
Revenue, including intersegment sales 842,565,000 820,886,000
Northwest and Central-East Europe    
Disclosure of geographical areas [line items]    
Revenue, including intersegment sales 868,115,000 801,928,000
Revenue 828,726,000 755,901,000
Northwest and Central-East Europe | Others    
Disclosure of geographical areas [line items]    
Revenue, including intersegment sales 65,789,000 61,854,000
Northwest and Central-East Europe | Netherlands    
Disclosure of geographical areas [line items]    
Revenue, including intersegment sales 633,337,000 571,757,000
Northwest and Central-East Europe | Denmark    
Disclosure of geographical areas [line items]    
Revenue, including intersegment sales 89,852,000 95,758,000
Northwest and Central-East Europe | Czech Republic    
Disclosure of geographical areas [line items]    
Revenue, including intersegment sales 79,137,000 72,559,000
Asia Pacific    
Disclosure of geographical areas [line items]    
Revenue, including intersegment sales 7,114,000 3,507,000
Revenue 956,145,000 904,038,000
Asia Pacific | Others    
Disclosure of geographical areas [line items]    
Revenue, including intersegment sales $ 7,114,000 $ 3,507,000