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Financial instruments - Maturity analysis for financial liabilities (Details) - CAD ($) $ in Thousands | Sep. 30, 2022 | Sep. 30, 2021
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Disclosure Of Maturity Analysis For Derivative And Non-Derivative Financial Liabilities [Line Items] |  |
Accounts payable and accrued liabilities | $ 1,016,407 | $ 891,374
Accrued compensation and employee-related liabilities | 1,130,726 | 1,084,014
Borrowings | 3,267,034 | 3,401,656
Clients’ funds obligations | 604,431 | 591,101
Financial liabilities | 6,739,989 | 6,793,366
Accounts payable and accrued liabilities, contractual cash flows | 1,016,407 | 891,374
Accrued compensation and employee related liabilities, contractual cash flows | 1,130,726 | 1,084,014
Clients' funds obligations, contractual cash flows | 604,431 | 591,101
Financial liabilities, contractual cash flows | 7,160,456 | 7,241,384
2014 U.S. Senior Notes |  |
Disclosure Of Maturity Analysis For Derivative And Non-Derivative Financial Liabilities [Line Items] |  |
Borrowings | 550,177 |
Borrowings, contractual cash flows | 591,467 |
2011 & 2014 U.S. Senior Notes |  |
Disclosure Of Maturity Analysis For Derivative And Non-Derivative Financial Liabilities [Line Items] |  |
Borrowings |  | 888,307
Borrowings, contractual cash flows |  | 955,768
2021 U.S. Senior Notes |  |
Disclosure Of Maturity Analysis For Derivative And Non-Derivative Financial Liabilities [Line Items] |  |
Borrowings | 1,361,974 | 1,253,226
Borrowings, contractual cash flows | 1,537,370 | 1,439,360
2021 CAD Senior Notes |  |
Disclosure Of Maturity Analysis For Derivative And Non-Derivative Financial Liabilities [Line Items] |  |
Borrowings | 595,900 | 595,331
Borrowings, contractual cash flows | 675,600 | 688,269
Unsecured committed term loan credit facility |  |
Disclosure Of Maturity Analysis For Derivative And Non-Derivative Financial Liabilities [Line Items] |  |
Borrowings | 687,705 | 633,623
Borrowings, contractual cash flows | 721,807 | 649,498
Lease liabilities |  |
Disclosure Of Maturity Analysis For Derivative And Non-Derivative Financial Liabilities [Line Items] |  |
Lease liabilities | 709,201 | 776,940
Lease liabilities, undiscounted cash flows | 808,445 | 877,498
Other long-term debt |  |
Disclosure Of Maturity Analysis For Derivative And Non-Derivative Financial Liabilities [Line Items] |  |
Borrowings | 71,278 | 31,169
Borrowings, contractual cash flows | 80,324 | 32,071
Cash flow hedges of future revenue |  |
Disclosure Of Maturity Analysis For Derivative And Non-Derivative Financial Liabilities [Line Items] |  |
Derivative financial liabilities | 10,505 | 2,601
Derivative financial liabilities, contractual cash flows | 304,698 | 163,162
Derivative financial assets, contractual cash flows | (311,446) | (171,282)
Cross-currency swaps |  |
Disclosure Of Maturity Analysis For Derivative And Non-Derivative Financial Liabilities [Line Items] |  |
Derivative financial liabilities | 1,685 | 45,680
Derivative financial liabilities, contractual cash flows | 168,213 | 1,128,791
Derivative financial assets, contractual cash flows | (167,586) | (1,088,240)
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 | 1,016,407 | 891,374
Accrued compensation and employee related liabilities, contractual cash flows | 1,130,726 | 1,084,014
Clients' funds obligations, contractual cash flows | 604,431 | 591,101
Financial liabilities, contractual cash flows | 3,116,826 | 3,230,686
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 | 90,680 |
Less than one year | 2011 & 2014 U.S. Senior Notes |  |
Disclosure Of Maturity Analysis For Derivative And Non-Derivative Financial Liabilities [Line Items] |  |
Borrowings, contractual cash flows |  | 410,738
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 | 24,623 | 22,690
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 | 12,669
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 | 27,053 | 7,043
Less than one year | Lease liabilities |  |
Disclosure Of Maturity Analysis For Derivative And Non-Derivative Financial Liabilities [Line Items] |  |
Lease liabilities, undiscounted cash flows | 182,815 | 192,750
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 | 25,843 | 13,133
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 | 110,827 | 55,039
Derivative financial assets, contractual cash flows | (109,319) | (55,756)
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 | 74,902 | 91,667
Derivative financial assets, contractual cash flows | (74,762) | (85,776)
Between one and three years |  |
Disclosure Of Maturity Analysis For Derivative And Non-Derivative Financial Liabilities [Line Items] |  |
Accounts payable and accrued liabilities, contractual cash flows | 0 | 0
Accrued compensation and employee related liabilities, contractual cash flows | 0 | 0
Clients' funds obligations, contractual cash flows | 0 | 0
Financial liabilities, contractual cash flows | 1,569,154 | 1,623,134
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 | 500,787 |
Between one and three years | 2011 & 2014 U.S. Senior Notes |  |
Disclosure Of Maturity Analysis For Derivative And Non-Derivative Financial Liabilities [Line Items] |  |
Borrowings, contractual cash flows |  | 545,030
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 | 49,246 | 45,380
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 | 694,754 | 642,455
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 | 295,017 | 318,993
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 | 11,919 | 18,337
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 | 193,871 | 103,373
Derivative financial assets, contractual cash flows | (202,127) | (110,294)
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 | 93,311 | 1,037,124
Derivative financial assets, contractual cash flows | (92,824) | (1,002,464)
Between three and five years |  |
Disclosure Of Maturity Analysis For Derivative And Non-Derivative Financial Liabilities [Line Items] |  |
Accounts payable and accrued liabilities, contractual cash flows | 0 | 0
Accrued compensation and employee related liabilities, contractual cash flows | 0 | 0
Clients' funds obligations, contractual cash flows | 0 | 0
Financial liabilities, contractual cash flows | 1,097,244 | 1,011,846
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 | 2011 & 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 | 862,639 | 805,940
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 | 25,200 | 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 | 166,848 | 180,593
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 | 42,557 | 595
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 | 0 | 4,750
Derivative financial assets, contractual cash flows | 0 | (5,232)
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] |  |
Accounts payable and accrued liabilities, contractual cash flows | 0 | 0
Accrued compensation and employee related liabilities, contractual cash flows | 0 | 0
Clients' funds obligations, contractual cash flows | 0 | 0
Financial liabilities, contractual cash flows | 1,377,232 | 1,375,718
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 | 2011 & 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 | 600,862 | 565,350
Beyond 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
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 | 163,765 | 185,162
Beyond five years | Other long-term debt |  |
Disclosure Of Maturity Analysis For Derivative And Non-Derivative Financial Liabilities [Line Items] |  |
Borrowings, contractual cash flows | 5 | 6
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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