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Financial instruments - Maturity analysis for financial liabilities (Details) - CAD ($) $ in Thousands | Sep. 30, 2025 | Sep. 30, 2024
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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

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