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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

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