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Financial instruments - Maturity analysis for financial liabilities (Details) - CAD ($)
$ in Thousands
Sep. 30, 2025
Sep. 30, 2024
Disclosure Of Maturity Analysis For Derivative And Non-Derivative Financial Liabilities [Line Items]    
Accounts payable and accrued liabilities $ 1,014,834 $ 999,790
Accrued compensation and employee-related liabilities 1,269,767 1,165,903
Borrowings 3,637,835 2,688,308
Clients’ funds obligations 973,673 504,515
Financial liabilities 7,787,320 6,011,388
Accounts payable and accrued liabilities, contractual cash flows 1,014,834 999,790
Accrued compensation and employee related liabilities, contractual cash flows 1,269,767 1,165,903
Clients' funds obligations, contractual cash flows 973,673 504,515
Financial liabilities, contractual cash flows 8,195,690 6,325,522
2021 U.S. Senior Notes    
Disclosure Of Maturity Analysis For Derivative And Non-Derivative Financial Liabilities [Line Items]    
Borrowings 1,386,564 1,342,758
Borrowings, contractual cash flows 1,481,011 1,462,053
2021 CAD Senior Notes    
Disclosure Of Maturity Analysis For Derivative And Non-Derivative Financial Liabilities [Line Items]    
Borrowings 597,892 597,212
Borrowings, contractual cash flows 637,380 650,400
2024 CAD Senior Notes    
Disclosure Of Maturity Analysis For Derivative And Non-Derivative Financial Liabilities [Line Items]    
Borrowings 747,001 746,144
Borrowings, contractual cash flows 846,508 879,191
2025 U.S. Senior Notes    
Disclosure Of Maturity Analysis For Derivative And Non-Derivative Financial Liabilities [Line Items]    
Borrowings 894,509  
Borrowings, contractual cash flows 1,105,226  
Lease liabilities    
Disclosure Of Maturity Analysis For Derivative And Non-Derivative Financial Liabilities [Line Items]    
Lease liabilities 693,484 620,095
Lease liabilities, undiscounted cash flows 779,572 697,298
Other long-term debt    
Disclosure Of Maturity Analysis For Derivative And Non-Derivative Financial Liabilities [Line Items]    
Borrowings 11,869 2,194
Borrowings, contractual cash flows 12,016 2,312
Cash flow hedges of future revenue    
Disclosure Of Maturity Analysis For Derivative And Non-Derivative Financial Liabilities [Line Items]    
Derivative financial liabilities 58,536 23,277
Derivative financial liabilities, contractual cash flows 1,602,133 744,758
Derivative financial assets, contractual cash flows (1,632,658) (758,162)
Cross-currency swaps    
Disclosure Of Maturity Analysis For Derivative And Non-Derivative Financial Liabilities [Line Items]    
Derivative financial liabilities 139,191 9,500
Derivative financial liabilities, contractual cash flows 2,797,646 1,496,435
Derivative financial assets, contractual cash flows (2,691,418) (1,518,971)
Less than one year    
Disclosure Of Maturity Analysis For Derivative And Non-Derivative Financial Liabilities [Line Items]    
Accounts payable and accrued liabilities, contractual cash flows 1,014,834 999,790
Accrued compensation and employee related liabilities, contractual cash flows 1,269,767 1,165,903
Clients' funds obligations, contractual cash flows 973,673 504,515
Financial liabilities, contractual cash flows 4,404,303 2,908,049
Less than one year | 2021 U.S. Senior Notes    
Disclosure Of Maturity Analysis For Derivative And Non-Derivative Financial Liabilities [Line Items]    
Borrowings, contractual cash flows 859,688 24,191
Less than one year | 2021 CAD Senior Notes    
Disclosure Of Maturity Analysis For Derivative And Non-Derivative Financial Liabilities [Line Items]    
Borrowings, contractual cash flows 12,180 12,600
Less than one year | 2024 CAD Senior Notes    
Disclosure Of Maturity Analysis For Derivative And Non-Derivative Financial Liabilities [Line Items]    
Borrowings, contractual cash flows 28,562 30,623
Less than one year | 2025 U.S. Senior Notes    
Disclosure Of Maturity Analysis For Derivative And Non-Derivative Financial Liabilities [Line Items]    
Borrowings, contractual cash flows 42,831  
Less than one year | Lease liabilities    
Disclosure Of Maturity Analysis For Derivative And Non-Derivative Financial Liabilities [Line Items]    
Lease liabilities, undiscounted cash flows 197,735 173,061
Less than one year | Other long-term debt    
Disclosure Of Maturity Analysis For Derivative And Non-Derivative Financial Liabilities [Line Items]    
Borrowings, contractual cash flows 11,147 1,028
Less than one year | Cash flow hedges of future revenue    
Disclosure Of Maturity Analysis For Derivative And Non-Derivative Financial Liabilities [Line Items]    
Derivative financial liabilities, contractual cash flows 505,880 186,439
Derivative financial assets, contractual cash flows (492,218) (175,510)
Less than one year | Cross-currency swaps    
Disclosure Of Maturity Analysis For Derivative And Non-Derivative Financial Liabilities [Line Items]    
Derivative financial liabilities, contractual cash flows 133,358 26,090
Derivative financial assets, contractual cash flows (153,134) (40,681)
Between one and three years    
Disclosure Of Maturity Analysis For Derivative And Non-Derivative Financial Liabilities [Line Items]    
Clients' funds obligations, contractual cash flows 0 0
Financial liabilities, contractual cash flows 1,434,884 1,439,068
Between one and three years | 2021 U.S. Senior Notes    
Disclosure Of Maturity Analysis For Derivative And Non-Derivative Financial Liabilities [Line Items]    
Borrowings, contractual cash flows 25,633 847,526
Between one and three years | 2021 CAD Senior Notes    
Disclosure Of Maturity Analysis For Derivative And Non-Derivative Financial Liabilities [Line Items]    
Borrowings, contractual cash flows 625,200 25,200
Between one and three years | 2024 CAD Senior Notes    
Disclosure Of Maturity Analysis For Derivative And Non-Derivative Financial Liabilities [Line Items]    
Borrowings, contractual cash flows 349,284 361,245
Between one and three years | 2025 U.S. Senior Notes    
Disclosure Of Maturity Analysis For Derivative And Non-Derivative Financial Liabilities [Line Items]    
Borrowings, contractual cash flows 89,646  
Between one and three years | Lease liabilities    
Disclosure Of Maturity Analysis For Derivative And Non-Derivative Financial Liabilities [Line Items]    
Lease liabilities, undiscounted cash flows 296,202 254,475
Between one and three years | Other long-term debt    
Disclosure Of Maturity Analysis For Derivative And Non-Derivative Financial Liabilities [Line Items]    
Borrowings, contractual cash flows 570 823
Between one and three years | Cash flow hedges of future revenue    
Disclosure Of Maturity Analysis For Derivative And Non-Derivative Financial Liabilities [Line Items]    
Derivative financial liabilities, contractual cash flows 845,772 545,077
Derivative financial assets, contractual cash flows (865,405) (568,052)
Between one and three years | Cross-currency swaps    
Disclosure Of Maturity Analysis For Derivative And Non-Derivative Financial Liabilities [Line Items]    
Derivative financial liabilities, contractual cash flows 1,127,564 353,834
Derivative financial assets, contractual cash flows (1,059,582) (381,060)
Between three and five years    
Disclosure Of Maturity Analysis For Derivative And Non-Derivative Financial Liabilities [Line Items]    
Clients' funds obligations, contractual cash flows 0 0
Financial liabilities, contractual cash flows 1,676,629 1,309,237
Between three and five years | 2021 U.S. Senior Notes    
Disclosure Of Maturity Analysis For Derivative And Non-Derivative Financial Liabilities [Line Items]    
Borrowings, contractual cash flows 25,633 24,868
Between three and five years | 2021 CAD Senior Notes    
Disclosure Of Maturity Analysis For Derivative And Non-Derivative Financial Liabilities [Line Items]    
Borrowings, contractual cash flows 0 612,600
Between three and five years | 2024 CAD Senior Notes    
Disclosure Of Maturity Analysis For Derivative And Non-Derivative Financial Liabilities [Line Items]    
Borrowings, contractual cash flows 468,662 487,323
Between three and five years | 2025 U.S. Senior Notes    
Disclosure Of Maturity Analysis For Derivative And Non-Derivative Financial Liabilities [Line Items]    
Borrowings, contractual cash flows 972,749  
Between three and five years | Lease liabilities    
Disclosure Of Maturity Analysis For Derivative And Non-Derivative Financial Liabilities [Line Items]    
Lease liabilities, undiscounted cash flows 177,385 166,326
Between three and five years | Other long-term debt    
Disclosure Of Maturity Analysis For Derivative And Non-Derivative Financial Liabilities [Line Items]    
Borrowings, contractual cash flows 204 197
Between three and five years | Cash flow hedges of future revenue    
Disclosure Of Maturity Analysis For Derivative And Non-Derivative Financial Liabilities [Line Items]    
Derivative financial liabilities, contractual cash flows 250,481 13,242
Derivative financial assets, contractual cash flows (275,035) (14,600)
Between three and five years | Cross-currency swaps    
Disclosure Of Maturity Analysis For Derivative And Non-Derivative Financial Liabilities [Line Items]    
Derivative financial liabilities, contractual cash flows 1,499,067 1,116,511
Derivative financial assets, contractual cash flows (1,442,517) (1,097,230)
Beyond five years    
Disclosure Of Maturity Analysis For Derivative And Non-Derivative Financial Liabilities [Line Items]    
Clients' funds obligations, contractual cash flows 0 0
Financial liabilities, contractual cash flows 679,874 669,168
Beyond five years | 2021 U.S. Senior Notes    
Disclosure Of Maturity Analysis For Derivative And Non-Derivative Financial Liabilities [Line Items]    
Borrowings, contractual cash flows 570,057 565,468
Beyond five years | 2021 CAD Senior Notes    
Disclosure Of Maturity Analysis For Derivative And Non-Derivative Financial Liabilities [Line Items]    
Borrowings, contractual cash flows 0 0
Beyond five years | 2024 CAD Senior Notes    
Disclosure Of Maturity Analysis For Derivative And Non-Derivative Financial Liabilities [Line Items]    
Borrowings, contractual cash flows 0 0
Beyond five years | 2025 U.S. Senior Notes    
Disclosure Of Maturity Analysis For Derivative And Non-Derivative Financial Liabilities [Line Items]    
Borrowings, contractual cash flows 0  
Beyond five years | Lease liabilities    
Disclosure Of Maturity Analysis For Derivative And Non-Derivative Financial Liabilities [Line Items]    
Lease liabilities, undiscounted cash flows 108,250 103,436
Beyond five years | Other long-term debt    
Disclosure Of Maturity Analysis For Derivative And Non-Derivative Financial Liabilities [Line Items]    
Borrowings, contractual cash flows 95 264
Beyond five years | Cash flow hedges of future revenue    
Disclosure Of Maturity Analysis For Derivative And Non-Derivative Financial Liabilities [Line Items]    
Derivative financial liabilities, contractual cash flows 0 0
Derivative financial assets, contractual cash flows 0 0
Beyond five years | Cross-currency swaps    
Disclosure Of Maturity Analysis For Derivative And Non-Derivative Financial Liabilities [Line Items]    
Derivative financial liabilities, contractual cash flows 37,657 0
Derivative financial assets, contractual cash flows $ (36,185) $ 0