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Financial instruments - Maturity analysis for financial liabilities (Details) - CAD ($)
$ in Thousands
Sep. 30, 2023
Sep. 30, 2022
Disclosure Of Maturity Analysis For Derivative And Non-Derivative Financial Liabilities [Line Items]    
Accounts payable and accrued liabilities $ 924,659 $ 1,016,407
Accrued compensation and employee-related liabilities 1,100,566 1,130,726
Borrowings 3,100,321 3,267,034
Clients’ funds obligations 493,638 604,431
Financial liabilities 6,267,360 6,739,989
Accounts payable and accrued liabilities, contractual cash flows 924,659 1,016,407
Accrued compensation and employee related liabilities, contractual cash flows 1,100,566 1,130,726
Clients' funds obligations, contractual cash flows 493,638 604,431
Financial liabilities, contractual cash flows 6,581,969 7,160,456
2014 U.S. Senior Notes    
Disclosure Of Maturity Analysis For Derivative And Non-Derivative Financial Liabilities [Line Items]    
Borrowings 473,808 550,177
Borrowings, contractual cash flows 492,722 591,467
2021 U.S. Senior Notes    
Disclosure Of Maturity Analysis For Derivative And Non-Derivative Financial Liabilities [Line Items]    
Borrowings 1,342,714 1,361,974
Borrowings, contractual cash flows 1,488,774 1,537,370
2021 CAD Senior Notes    
Disclosure Of Maturity Analysis For Derivative And Non-Derivative Financial Liabilities [Line Items]    
Borrowings 596,550 595,900
Borrowings, contractual cash flows 663,000 675,600
Unsecured committed term loan credit facility    
Disclosure Of Maturity Analysis For Derivative And Non-Derivative Financial Liabilities [Line Items]    
Borrowings 676,886 687,705
Borrowings, contractual cash flows 687,419 721,807
Lease liabilities    
Disclosure Of Maturity Analysis For Derivative And Non-Derivative Financial Liabilities [Line Items]    
Lease liabilities 641,963 709,201
Lease liabilities, undiscounted cash flows 722,284 808,445
Other long-term debt    
Disclosure Of Maturity Analysis For Derivative And Non-Derivative Financial Liabilities [Line Items]    
Borrowings 10,363 71,278
Borrowings, contractual cash flows 10,448 80,324
Cash flow hedges of future revenue    
Disclosure Of Maturity Analysis For Derivative And Non-Derivative Financial Liabilities [Line Items]    
Derivative financial liabilities 4,030 10,505
Derivative financial liabilities, contractual cash flows 328,455 304,698
Derivative financial assets, contractual cash flows (331,954) (311,446)
Cross-currency swaps    
Disclosure Of Maturity Analysis For Derivative And Non-Derivative Financial Liabilities [Line Items]    
Derivative financial liabilities 2,183 1,685
Derivative financial liabilities, contractual cash flows 93,311 168,213
Derivative financial assets, contractual cash flows (91,353) (167,586)
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 924,659 1,016,407
Accrued compensation and employee related liabilities, contractual cash flows 1,100,566 1,130,726
Clients' funds obligations, contractual cash flows 493,638 604,431
Financial liabilities, contractual cash flows 3,969,359 3,116,826
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 90,680
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 24,233 24,623
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 | 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 27,053
Less than one year | Lease liabilities    
Disclosure Of Maturity Analysis For Derivative And Non-Derivative Financial Liabilities [Line Items]    
Lease liabilities, undiscounted cash flows 221,877 182,815
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 8,353 25,843
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 155,450 110,827
Derivative financial assets, contractual cash flows (154,116) (109,319)
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 93,311 74,902
Derivative financial assets, contractual cash flows (91,353) (74,762)
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 1,121,407 1,569,154
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 0 500,787
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 860,746 49,246
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 | Unsecured committed term loan credit facility    
Disclosure Of Maturity Analysis For Derivative And Non-Derivative Financial Liabilities [Line Items]    
Borrowings, contractual cash flows 0 694,754
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 238,009 295,017
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 1,328 11,919
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 163,091 193,871
Derivative financial assets, contractual cash flows (166,967) (202,127)
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 0 93,311
Derivative financial assets, contractual cash flows 0 (92,824)
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 788,877 1,097,244
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 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 24,910 862,639
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 625,200 25,200
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 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 139,275 166,848
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 449 42,557
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 9,914 0
Derivative financial assets, contractual cash flows (10,871) 0
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 0 0
Derivative financial assets, contractual cash flows 0 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 702,326 1,377,232
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 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 578,885 600,862
Beyond five years | 2021 CAD Senior Notes    
Disclosure Of Maturity Analysis For Derivative And Non-Derivative Financial Liabilities [Line Items]    
Borrowings, contractual cash flows 0 612,600
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 0
Beyond five years | Lease liabilities    
Disclosure Of Maturity Analysis For Derivative And Non-Derivative Financial Liabilities [Line Items]    
Lease liabilities, undiscounted cash flows 123,123 163,765
Beyond five years | Other long-term debt    
Disclosure Of Maturity Analysis For Derivative And Non-Derivative Financial Liabilities [Line Items]    
Borrowings, contractual cash flows 318 5
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