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Financial instruments - Maturity analysis for financial liabilities (Details) - CAD ($) $ in Thousands | Sep. 30, 2024 | Sep. 30, 2023
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Disclosure Of Maturity Analysis For Derivative And Non-Derivative Financial Liabilities [Line Items] |  |
Accounts payable and accrued liabilities | $ 999,790 | $ 924,659
Accrued compensation and employee-related liabilities | 1,165,903 | 1,100,566
Borrowings | 2,688,308 | 3,100,321
Clients’ funds obligations | 504,515 | 493,638
Financial liabilities | 6,011,388 | 6,267,360
Accounts payable and accrued liabilities, contractual cash flows | 999,790 | 924,659
Accrued compensation and employee related liabilities, contractual cash flows | 1,165,903 | 1,100,566
Clients' funds obligations, contractual cash flows | 504,515 | 493,638
Financial liabilities, contractual cash flows | 6,325,522 | 6,581,969
2014 U.S. Senior Notes |  |
Disclosure Of Maturity Analysis For Derivative And Non-Derivative Financial Liabilities [Line Items] |  |
Borrowings |  | 473,808
Borrowings, contractual cash flows |  | 492,722
2021 U.S. Senior Notes |  |
Disclosure Of Maturity Analysis For Derivative And Non-Derivative Financial Liabilities [Line Items] |  |
Borrowings | 1,342,758 | 1,342,714
Borrowings, contractual cash flows | 1,462,053 | 1,488,774
2021 CAD Senior Notes |  |
Disclosure Of Maturity Analysis For Derivative And Non-Derivative Financial Liabilities [Line Items] |  |
Borrowings | 597,212 | 596,550
Borrowings, contractual cash flows | 650,400 | 663,000
2024 CAD Senior Notes |  |
Disclosure Of Maturity Analysis For Derivative And Non-Derivative Financial Liabilities [Line Items] |  |
Borrowings | 746,144 |
Borrowings, contractual cash flows | 879,191 |
Unsecured committed term loan credit facility |  |
Disclosure Of Maturity Analysis For Derivative And Non-Derivative Financial Liabilities [Line Items] |  |
Borrowings |  | 676,886
Borrowings, contractual cash flows |  | 687,419
Lease liabilities |  |
Disclosure Of Maturity Analysis For Derivative And Non-Derivative Financial Liabilities [Line Items] |  |
Lease liabilities | 620,095 | 641,963
Lease liabilities, undiscounted cash flows | 697,298 | 722,284
Other long-term debt |  |
Disclosure Of Maturity Analysis For Derivative And Non-Derivative Financial Liabilities [Line Items] |  |
Borrowings | 2,194 | 10,363
Borrowings, contractual cash flows | 2,312 | 10,448
Cash flow hedges of future revenue |  |
Disclosure Of Maturity Analysis For Derivative And Non-Derivative Financial Liabilities [Line Items] |  |
Derivative financial liabilities | 23,277 | 4,030
Derivative financial liabilities, contractual cash flows | 744,758 | 328,455
Derivative financial assets, contractual cash flows | (758,162) | (331,954)
Cross-currency swaps |  |
Disclosure Of Maturity Analysis For Derivative And Non-Derivative Financial Liabilities [Line Items] |  |
Derivative financial liabilities | 9,500 | 2,183
Derivative financial liabilities, contractual cash flows | 1,496,435 | 93,311
Derivative financial assets, contractual cash flows | (1,518,971) | (91,353)
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 | 999,790 | 924,659
Accrued compensation and employee related liabilities, contractual cash flows | 1,165,903 | 1,100,566
Clients' funds obligations, contractual cash flows | 504,515 | 493,638
Financial liabilities, contractual cash flows | 2,908,049 | 3,969,359
Less than one year | 2014 U.S. Senior Notes |  |
Disclosure Of Maturity Analysis For Derivative And Non-Derivative Financial Liabilities [Line Items] |  |
Borrowings, contractual cash flows |  | 492,722
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 | 24,191 | 24,233
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 | 12,600 | 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 | 30,623 |
Less than one year | Unsecured committed term loan credit facility |  |
Disclosure Of Maturity Analysis For Derivative And Non-Derivative Financial Liabilities [Line Items] |  |
Borrowings, contractual cash flows |  | 687,419
Less than one year | Lease liabilities |  |
Disclosure Of Maturity Analysis For Derivative And Non-Derivative Financial Liabilities [Line Items] |  |
Lease liabilities, undiscounted cash flows | 173,061 | 221,877
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 | 1,028 | 8,353
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 | 186,439 | 155,450
Derivative financial assets, contractual cash flows | (175,510) | (154,116)
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 | 26,090 | 93,311
Derivative financial assets, contractual cash flows | (40,681) | (91,353)
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 | 1,439,068 | 1,121,407
Between one and three years | 2014 U.S. Senior Notes |  |
Disclosure Of Maturity Analysis For Derivative And Non-Derivative Financial Liabilities [Line Items] |  |
Borrowings, contractual cash flows |  | 0
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 | 847,526 | 860,746
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 | 25,200 | 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 | 361,245 |
Between one and three years | Unsecured committed term loan credit facility |  |
Disclosure Of Maturity Analysis For Derivative And Non-Derivative Financial Liabilities [Line Items] |  |
Borrowings, contractual cash flows |  | 0
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 | 254,475 | 238,009
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 | 823 | 1,328
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 | 545,077 | 163,091
Derivative financial assets, contractual cash flows | (568,052) | (166,967)
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 | 353,834 | 0
Derivative financial assets, contractual cash flows | (381,060) | 0
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 | 1,309,237 | 788,877
Between three and five years | 2014 U.S. Senior Notes |  |
Disclosure Of Maturity Analysis For Derivative And Non-Derivative Financial Liabilities [Line Items] |  |
Borrowings, contractual cash flows |  | 0
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 | 24,868 | 24,910
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 | 612,600 | 625,200
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 | 487,323 |
Between three and five years | Unsecured committed term loan credit facility |  |
Disclosure Of Maturity Analysis For Derivative And Non-Derivative Financial Liabilities [Line Items] |  |
Borrowings, contractual cash flows |  | 0
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 | 166,326 | 139,275
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 | 197 | 449
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 | 13,242 | 9,914
Derivative financial assets, contractual cash flows | (14,600) | (10,871)
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 | 1,116,511 | 0
Derivative financial assets, contractual cash flows | (1,097,230) | 0
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 | 669,168 | 702,326
Beyond five years | 2014 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 | 2021 U.S. Senior Notes |  |
Disclosure Of Maturity Analysis For Derivative And Non-Derivative Financial Liabilities [Line Items] |  |
Borrowings, contractual cash flows | 565,468 | 578,885
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 |
Beyond five years | Unsecured committed term loan credit facility |  |
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 | 103,436 | 123,123
Beyond five years | Other long-term debt |  |
Disclosure Of Maturity Analysis For Derivative And Non-Derivative Financial Liabilities [Line Items] |  |
Borrowings, contractual cash flows | 264 | 318
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 | 0 | 0
Derivative financial assets, contractual cash flows | $ 0 | $ 0

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