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Segmented information - Disclosure of revenue information by location (Details) - CAD ($)
 12 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Disclosure of geographical areas [line items]    
Revenue $ 14,296,360,000 $ 12,867,201,000
Western and Southern Europe    
Disclosure of geographical areas [line items]    
Revenue, including intersegment sales 2,563,876,000 2,116,082,000
Revenue 2,605,926,000 2,152,113,000
Western and Southern Europe | France    
Disclosure of geographical areas [line items]    
Revenue, including intersegment sales 2,277,088,000 1,846,832,000
Western and Southern Europe | Portugal    
Disclosure of geographical areas [line items]    
Revenue, including intersegment sales 116,928,000 105,225,000
Western and Southern Europe | Spain    
Disclosure of geographical areas [line items]    
Revenue, including intersegment sales 114,341,000 111,515,000
Western and Southern Europe | Others    
Disclosure of geographical areas [line items]    
Revenue, including intersegment sales 55,519,000 52,510,000
U.S. | U.S.    
Disclosure of geographical areas [line items]    
Revenue, including intersegment sales 4,404,982,000 3,987,025,000
U.S. Commercial and State Government    
Disclosure of geographical areas [line items]    
Revenue 2,277,996,000 2,075,321,000
U.S. Commercial and State Government | U.S.    
Disclosure of geographical areas [line items]    
Revenue, including intersegment sales 2,461,366,000 2,226,473,000
U.S. Federal    
Disclosure of geographical areas [line items]    
Revenue 1,935,238,000 1,750,902,000
U.S. Federal | U.S.    
Disclosure of geographical areas [line items]    
Revenue, including intersegment sales 1,943,616,000 1,760,552,000
Canada    
Disclosure of geographical areas [line items]    
Revenue 2,064,659,000 1,981,380,000
Canada | Canada    
Disclosure of geographical areas [line items]    
Revenue, including intersegment sales 2,232,091,000 2,143,211,000
Scandinavia and Central Europe    
Disclosure of geographical areas [line items]    
Revenue, including intersegment sales 1,740,285,000 1,652,658,000
Revenue 1,648,356,000 1,571,118,000
Scandinavia and Central Europe | Germany    
Disclosure of geographical areas [line items]    
Revenue, including intersegment sales 925,679,000 811,458,000
Scandinavia and Central Europe | Sweden    
Disclosure of geographical areas [line items]    
Revenue, including intersegment sales 691,240,000 697,941,000
Scandinavia and Central Europe | Norway    
Disclosure of geographical areas [line items]    
Revenue, including intersegment sales 123,366,000 143,259,000
U.K. and Australia    
Disclosure of geographical areas [line items]    
Revenue, including intersegment sales 1,679,241,000 1,472,907,000
Revenue 1,455,529,000 1,291,125,000
U.K. and Australia | U.K.    
Disclosure of geographical areas [line items]    
Revenue, including intersegment sales 1,588,665,000 1,397,161,000
U.K. and Australia | Australia    
Disclosure of geographical areas [line items]    
Revenue, including intersegment sales 90,576,000 75,746,000
Finland, Poland and Baltics    
Disclosure of geographical areas [line items]    
Revenue, including intersegment sales 870,450,000 762,529,000
Revenue 828,951,000 729,024,000
Finland, Poland and Baltics | Others    
Disclosure of geographical areas [line items]    
Revenue, including intersegment sales 49,564,000 34,676,000
Finland, Poland and Baltics | Finland    
Disclosure of geographical areas [line items]    
Revenue, including intersegment sales 820,886,000 727,853,000
Northwest and Central-East Europe    
Disclosure of geographical areas [line items]    
Revenue, including intersegment sales 801,928,000 728,329,000
Revenue 755,901,000 692,859,000
Northwest and Central-East Europe | Others    
Disclosure of geographical areas [line items]    
Revenue, including intersegment sales 61,854,000 64,632,000
Northwest and Central-East Europe | Netherlands    
Disclosure of geographical areas [line items]    
Revenue, including intersegment sales 571,757,000 494,227,000
Northwest and Central-East Europe | Denmark    
Disclosure of geographical areas [line items]    
Revenue, including intersegment sales 95,758,000 114,849,000
Northwest and Central-East Europe | Czech Republic    
Disclosure of geographical areas [line items]    
Revenue, including intersegment sales 72,559,000 54,621,000
Asia Pacific    
Disclosure of geographical areas [line items]    
Revenue, including intersegment sales 3,507,000 4,460,000
Revenue 918,056,000 799,661,000
Asia Pacific | Others    
Disclosure of geographical areas [line items]    
Revenue, including intersegment sales $ 3,507,000 $ 4,460,000