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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