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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

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