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Segmented information - Disclosure of operating segment information (Details) - CAD ($) | 12 Months Ended
--- | ---
Sep. 30, 2023 | Sep. 30, 2022
Disclosure of operating segments [line items] |  |
Segment revenue | $ 14,296,360,000 | $ 12,867,201,000
Segment earnings before acquisition-related and integration costs, net finance costs and income tax expense | 2,312,741,000 | 2,086,636,000
Acquisition-related and integration costs | (53,401,000) | (27,654,000)
Cost optimization program (Note 25) | (8,964,000) |
Net finance costs | (52,463,000) | (92,023,000)
Earnings before income taxes | 2,197,913,000 | 1,966,959,000
Amortization and depreciation, without amortization of deferred financing fees | 507,087,000 | 470,572,000
Impairment included in amortisation from business solutions and contract costs |  | 3,359,000
Western and Southern Europe |  |
Disclosure of operating segments [line items] |  |
Segment revenue | 2,605,926,000 | 2,152,113,000
Segment earnings before acquisition-related and integration costs, net finance costs and income tax expense | 355,578,000 | 289,730,000
Amortization and depreciation, without amortization of deferred financing fees | 85,049,000 | 62,922,000
Impairment included in amortisation from business solutions and contract costs |  | 2,131,000
U.S. Commercial and State Government |  |
Disclosure of operating segments [line items] |  |
Segment revenue | 2,277,996,000 | 2,075,321,000
Segment earnings before acquisition-related and integration costs, net finance costs and income tax expense | 339,410,000 | 304,767,000
Amortization and depreciation, without amortization of deferred financing fees | 83,359,000 | 70,417,000
Canada |  |
Disclosure of operating segments [line items] |  |
Segment revenue | 2,064,659,000 | 1,981,380,000
Segment earnings before acquisition-related and integration costs, net finance costs and income tax expense | 477,502,000 | 463,289,000
Amortization and depreciation, without amortization of deferred financing fees | 55,589,000 | 57,528,000
U.S. Federal |  |
Disclosure of operating segments [line items] |  |
Segment revenue | 1,935,238,000 | 1,750,902,000
Segment earnings before acquisition-related and integration costs, net finance costs and income tax expense | 306,362,000 | 276,395,000
Amortization and depreciation, without amortization of deferred financing fees | 59,334,000 | 54,073,000
Scandinavia and Central Europe |  |
Disclosure of operating segments [line items] |  |
Segment revenue | 1,648,356,000 | 1,571,118,000
Segment earnings before acquisition-related and integration costs, net finance costs and income tax expense | 127,320,000 | 125,728,000
Amortization and depreciation, without amortization of deferred financing fees | 90,098,000 | 91,435,000
U.K. and Australia |  |
Disclosure of operating segments [line items] |  |
Segment revenue | 1,455,529,000 | 1,291,125,000
Segment earnings before acquisition-related and integration costs, net finance costs and income tax expense | 216,517,000 | 200,117,000
Amortization and depreciation, without amortization of deferred financing fees | 38,423,000 | 40,765,000
Finland, Poland and Baltics |  |
Disclosure of operating segments [line items] |  |
Segment revenue | 828,951,000 | 729,024,000
Segment earnings before acquisition-related and integration costs, net finance costs and income tax expense | 110,583,000 | 96,651,000
Amortization and depreciation, without amortization of deferred financing fees | 38,345,000 | 33,219,000
Northwest and Central-East Europe |  |
Disclosure of operating segments [line items] |  |
Segment revenue | 755,901,000 | 692,859,000
Segment earnings before acquisition-related and integration costs, net finance costs and income tax expense | 101,871,000 | 88,287,000
Amortization and depreciation, without amortization of deferred financing fees | 31,616,000 | 34,323,000
Asia Pacific |  |
Disclosure of operating segments [line items] |  |
Segment revenue | 918,056,000 | 799,661,000
Segment earnings before acquisition-related and integration costs, net finance costs and income tax expense | 277,598,000 | 241,672,000
Amortization and depreciation, without amortization of deferred financing fees | 25,274,000 | 25,890,000
Eliminations |  |
Disclosure of operating segments [line items] |  |
Segment revenue | (194,252,000) | (176,302,000)
Segment earnings before acquisition-related and integration costs, net finance costs and income tax expense | $ 0 | $ 0

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