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Segmented information - Disclosure of operating segment information (Details) - CAD ($) | 12 Months Ended
--- | ---
Sep. 30, 2025 | Sep. 30, 2024
Disclosure of operating segments [line items] |  |
Segment revenue | $ 15,912,673,000 | $ 14,676,152,000
Segment earnings before restructuring, acquisition and related integration costs, net finance costs and income tax expense | 2,610,913,000 | 2,415,769,000
Restructuring, acquisition and related integration costs (Note 25) | (285,031,000) | (96,929,000)
Net finance costs (Note 26) | (83,692,000) | (27,889,000)
Earnings before income taxes | 2,242,190,000 | 2,290,951,000
Salaries, other employee costs and contracted labour costs | 11,184,452,000 | 10,301,386,000
Amortization and depreciation | 589,796,000 | 523,530,000
Impairment | 6,716,000 | 11,574,000
Western and Southern Europe |  |
Disclosure of operating segments [line items] |  |
Segment revenue | 2,679,167,000 | 2,600,198,000
Segment earnings before restructuring, acquisition and related integration costs, net finance costs and income tax expense | 354,421,000 | 334,165,000
Salaries, other employee costs and contracted labour costs | 2,084,539,000 | 2,039,082,000
Amortization and depreciation | 76,012,000 | 71,807,000
U.S. Commercial and State Government |  |
Disclosure of operating segments [line items] |  |
Segment revenue | 2,522,956,000 | 2,327,309,000
Segment earnings before restructuring, acquisition and related integration costs, net finance costs and income tax expense | 359,174,000 | 337,325,000
Salaries, other employee costs and contracted labour costs | 1,820,400,000 | 1,645,109,000
Amortization and depreciation | 102,678,000 | 97,552,000
Impairment | 5,546,000 | 7,932,000
U.S. Federal |  |
Disclosure of operating segments [line items] |  |
Segment revenue | 2,247,943,000 | 2,001,391,000
Segment earnings before restructuring, acquisition and related integration costs, net finance costs and income tax expense | 331,976,000 | 322,698,000
Salaries, other employee costs and contracted labour costs | 1,651,615,000 | 1,457,486,000
Amortization and depreciation | 76,486,000 | 60,779,000
Canada |  |
Disclosure of operating segments [line items] |  |
Segment revenue | 2,090,682,000 | 2,034,995,000
Segment earnings before restructuring, acquisition and related integration costs, net finance costs and income tax expense | 472,888,000 | 463,171,000
Salaries, other employee costs and contracted labour costs | 1,264,788,000 | 1,255,333,000
Amortization and depreciation | 68,741,000 | 60,132,000
Scandinavia, Northwest and Central- East Europe |  |
Disclosure of operating segments [line items] |  |
Segment revenue | 1,688,887,000 | 1,593,434,000
Segment earnings before restructuring, acquisition and related integration costs, net finance costs and income tax expense | 235,202,000 | 191,752,000
Salaries, other employee costs and contracted labour costs | 1,124,215,000 | 1,070,070,000
Amortization and depreciation | 87,011,000 | 82,146,000
U.K. and Australia |  |
Disclosure of operating segments [line items] |  |
Segment revenue | 2,020,016,000 | 1,584,833,000
Segment earnings before restructuring, acquisition and related integration costs, net finance costs and income tax expense | 299,345,000 | 251,662,000
Salaries, other employee costs and contracted labour costs | 1,359,727,000 | 1,003,640,000
Amortization and depreciation | 60,636,000 | 44,999,000
Germany |  |
Disclosure of operating segments [line items] |  |
Segment revenue | 901,609,000 | 894,565,000
Segment earnings before restructuring, acquisition and related integration costs, net finance costs and income tax expense | 108,107,000 | 88,438,000
Salaries, other employee costs and contracted labour costs | 693,328,000 | 702,588,000
Amortization and depreciation | 41,608,000 | 39,507,000
Finland, Poland and Baltics |  |
Disclosure of operating segments [line items] |  |
Segment revenue | 903,701,000 | 859,263,000
Segment earnings before restructuring, acquisition and related integration costs, net finance costs and income tax expense | 142,128,000 | 133,437,000
Salaries, other employee costs and contracted labour costs | 571,621,000 | 553,997,000
Amortization and depreciation | 40,408,000 | 37,700,000
Asia Pacific |  |
Disclosure of operating segments [line items] |  |
Segment revenue | 1,014,441,000 | 956,145,000
Segment earnings before restructuring, acquisition and related integration costs, net finance costs and income tax expense | 307,672,000 | 293,121,000
Salaries, other employee costs and contracted labour costs | 614,219,000 | 574,081,000
Amortization and depreciation | 36,216,000 | 28,908,000
Eliminations |  |
Disclosure of operating segments [line items] |  |
Segment revenue | (156,729,000) | (175,981,000)
Segment earnings before restructuring, acquisition and related integration costs, net finance costs and income tax expense | 0 | 0
Salaries, other employee costs and contracted labour costs | 0 | 0
Amortization and depreciation | $ 0 | $ 0

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