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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

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