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Financial instruments - Maturity analysis for financial liabilities (Details) - CAD ($)
$ in Thousands
Sep. 30, 2024
Sep. 30, 2023
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