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Financial instruments (Tables)
12 Months Ended
Sep. 30, 2025
Financial Instruments [Abstract]  
Disclosure of financial liabilities included in the long-term debt
The following table presents the financial liabilities included in the long-term debt (Note 14) measured at amortized cost categorized using the fair value hierarchy.
As at September 30, 2025 As at September 30, 2024
Level Carrying amount Fair value Carrying amount Fair value
       $ $ $ $
2021 U.S. Senior Notes Level 2 1,386,564  1,310,044  1,342,758  1,223,120 
2021 CAD Senior Notes Level 2 597,892  580,561  597,212  564,768 
2024 CAD Senior Notes Level 2 747,001  766,844  746,144  759,375 
2025 U.S. Senior Notes Level 2 894,509  930,366  —  — 
Other long-term debt Level 2 11,869  11,892  2,194  2,119 
3,637,835  3,599,707  2,688,308  2,549,382 
Disclosure of fair value measurement of financial assets
The following table presents financial assets and liabilities measured at fair value categorized using the fair value hierarchy:
Level As at September 30, 2025 As at September 30, 2024
$ $
 Financial assets
FVTE
Cash and cash equivalents Level 2 864,209  1,461,145 
Cash included in funds held for clients (Note 5)
Level 2 704,503  233,584 
Deferred compensation plan assets (Note 11)
Level 1 125,388  112,270 

1,694,100  1,806,999 
Derivative financial instruments designated as
     hedging instruments
Current derivative financial instruments included in current financial assets Level 2
Cross-currency swaps
1,011  — 
Foreign currency forward contracts
1,481  5,055 
Long-term derivative financial instruments (Note 11)
Level 2
Cross-currency swaps
395  — 
Foreign currency forward contracts 459  2,644 

3,346  7,699 
FVOCI
Short-term investments included in current financial assets Level 2 3,675  3,279 
Long-term bonds included in funds held for clients (Note 5)
Level 2 240,932  223,196 
Long-term investments (Note 11)
Level 2 27,687  24,209 
272,294  250,684 
 Financial liabilities
 Derivative financial instruments designated as
      hedging instruments
Current derivative financial instruments Level 2
Cross-currency swaps
3,036  — 
Foreign currency forward contracts
21,586  13,073 
Long-term derivative financial instruments Level 2
Cross-currency swaps
136,155  9,500 
Foreign currency forward contracts
36,950  10,204 
197,727  32,777 
Disclosure of fair value measurement of financial liabilities
The following table presents financial assets and liabilities measured at fair value categorized using the fair value hierarchy:
Level As at September 30, 2025 As at September 30, 2024
$ $
 Financial assets
FVTE
Cash and cash equivalents Level 2 864,209  1,461,145 
Cash included in funds held for clients (Note 5)
Level 2 704,503  233,584 
Deferred compensation plan assets (Note 11)
Level 1 125,388  112,270 

1,694,100  1,806,999 
Derivative financial instruments designated as
     hedging instruments
Current derivative financial instruments included in current financial assets Level 2
Cross-currency swaps
1,011  — 
Foreign currency forward contracts
1,481  5,055 
Long-term derivative financial instruments (Note 11)
Level 2
Cross-currency swaps
395  — 
Foreign currency forward contracts 459  2,644 

3,346  7,699 
FVOCI
Short-term investments included in current financial assets Level 2 3,675  3,279 
Long-term bonds included in funds held for clients (Note 5)
Level 2 240,932  223,196 
Long-term investments (Note 11)
Level 2 27,687  24,209 
272,294  250,684 
 Financial liabilities
 Derivative financial instruments designated as
      hedging instruments
Current derivative financial instruments Level 2
Cross-currency swaps
3,036  — 
Foreign currency forward contracts
21,586  13,073 
Long-term derivative financial instruments Level 2
Cross-currency swaps
136,155  9,500 
Foreign currency forward contracts
36,950  10,204 
197,727  32,777 
Disclosure of detailed information about cross-currency swap agreements
The following tables summarize the cross-currency swap agreements that the Company had entered into in order to manage its currency:
As at
September 30, 2025
As at
September 30, 2024
Receive Notional Receive Rate Pay Notional Pay rate Maturity Fair value Fair value
$ $
Hedges of net investments in European operations
$1,270,000
From 1.62% to 4.15%
€866,365
From (0.14)% to 3.70%
From September 2027 to 2029 (109,168) (7,806)
$80,000
4.15%
SEK609,940
From 3.49% to 3.51%
September 2029 (9,090) (1,694)
Hedges of net investments in European operations and cash flow hedges on the 2021 U.S. Senior Notes
U.S.$63,500
From 1.45% to 2.30%
SEK619,583
From (0.73)% to 1.01%
From September 2026 to 2031 (2,448) — 
U.S.$11,500
From 1.45% to 2.30%
DKK73,986
From (1.01)% to 0.85%
From September 2026 to 2031 (54) — 
Cash flow hedges on the 2025 U.S. Senior Notes
U.S.$650,000
4.95%
$933,985
3.71%
March 2030 (17,025) — 
Total (137,785) (9,500)
Disclosure of notional, average contract rates, maturities and sensitivity analysis for currency risk
As at September 30, 2025, the Company held foreign currency forward contracts to hedge exposures to changes in foreign currency, which have the following notional, average contract rates and maturities:
Average contract rates
As at
September 30, 2025
As at
September 30, 2024
Foreign currency forward contracts
Notional
Less than one year
More than one year
Fair value
Fair value
$ $
USD/INR U.S.$482,362 87.72 92.05 (16,732) 2,091 
CAD/INR $458,999 64.89 68.22 (5,425) 314 
EUR/INR €170,890 99.00 107.80 (17,312) (1,156)
GBP/INR £129,282 112.00 120.29 (12,921) (8,700)
SEK/INR kr258,452 8.72 9.63 (3,075) (720)
GBP/EUR £104,627 1.15 223  (5,763)
GBP/SEK £56,618 12.63 (210) — 
EUR/MAD €6,000 10.58 (87) (548)
EUR/CZK €25,800 25.04 25.51 724  (473)
Others $58,644 (1,781) (623)
Total (56,596) (15,578)
The following table details the Company's sensitivity to a 10% strengthening of the euro, the U.S. dollar, the British pound and the Swedish krona, foreign currency rates on net earnings and on other comprehensive income (loss). The sensitivity analysis on net earnings presents the impact of foreign currency denominated financial instruments and adjusts their translation at period end for a 10% strengthening in foreign currency rates. The sensitivity analysis on other comprehensive income (loss) presents the impact of a 10% strengthening in foreign currency rates on the fair value of foreign currency forward contracts designated as cash flow hedges and on net investment hedges.
2025 2024
euro
impact
U.S. dollar
 impact
British pound impact Swedish
krona impact
euro
impact
U.S. dollar
 impact
British pound impact Swedish
krona impact
$ $ $ $ $ $ $ $
Increase in net
   earnings
2,806  5,827  990  265  150  1,359  1,179  521 
 Decrease in other
   comprehensive income (loss)
(211,271) (235,753) (22,262) (20,296) (174,239) (180,405) (17,269) (9,631)
Disclosure of maturity analysis for non-derivative financial liabilities
The following tables summarize the carrying amount and the contractual maturities of both the interest and principal portion of financial liabilities. All amounts contractually denominated in foreign currency are presented in Canadian dollar equivalent amounts using the period-end spot rate or floating rate.
As at September 30, 2025
Carrying amount
Contractual cash flows
Less than
one year
Between one and
three years
Between
three and five years
Beyond
five years
$
$
$
$
$
$
Non-derivative financial liabilities
Accounts payable and accrued liabilities 1,014,834  1,014,834  1,014,834  —  —  — 
Accrued compensation and employee-related
   liabilities
1,269,767  1,269,767  1,269,767  —  —  — 
2021 U.S. Senior Notes 1,386,564  1,481,011  859,688  25,633  25,633  570,057 
2021 CAD Senior Notes 597,892  637,380  12,180  625,200  —  — 
2024 CAD Senior Notes 747,001  846,508  28,562  349,284  468,662  — 
2025 U.S. Senior Notes 894,509  1,105,226  42,831  89,646  972,749  — 
Lease liabilities 693,484  779,572  197,735  296,202  177,385  108,250 
Other long-term debt 11,869  12,016  11,147  570  204  95 
Clients’ funds obligations 973,673  973,673  973,673  —  —  — 
Derivative financial liabilities
Cash flow hedges of future revenue 58,536 
Outflow
1,602,133  505,880  845,772  250,481  — 
(Inflow)
(1,632,658) (492,218) (865,405) (275,035) — 
Cross-currency swaps 139,191 
Outflow
2,797,646  133,358  1,127,564  1,499,067  37,657 
(Inflow)
(2,691,418) (153,134) (1,059,582) (1,442,517) (36,185)
7,787,320  8,195,690  4,404,303  1,434,884  1,676,629  679,874 

As at September 30, 2024
Carrying amount
Contractual cash flows
Less than
one year
Between one and
three years
Between
three and five years
Beyond
five years
$
$
$
$
$
$
Non-derivative financial liabilities
Accounts payable and accrued liabilities 999,790  999,790  999,790  —  —  — 
Accrued compensation and employee-related
   liabilities
1,165,903  1,165,903  1,165,903  —  —  — 
2021 U.S. Senior Notes 1,342,758  1,462,053  24,191  847,526  24,868  565,468 
2021 CAD Senior Notes 597,212  650,400  12,600  25,200  612,600  — 
2024 CAD Senior Notes 746,144  879,191  30,623  361,245  487,323  — 
Lease liabilities 620,095  697,298  173,061  254,475  166,326  103,436 
Other long-term debt 2,194  2,312  1,028  823  197  264 
Clients’ funds obligations 504,515  504,515  504,515  —  —  — 
Derivative financial liabilities
Cash flow hedges of future revenue 23,277 
Outflow 744,758  186,439  545,077  13,242  — 
(Inflow) (758,162) (175,510) (568,052) (14,600) — 
Cross-currency swaps 9,500 
Outflow 1,496,435  26,090  353,834  1,116,511  — 
(Inflow) (1,518,971) (40,681) (381,060) (1,097,230) — 
6,011,388  6,325,522  2,908,049  1,439,068  1,309,237  669,168 
Disclosure of maturity analysis for derivative financial liabilities
The following tables summarize the carrying amount and the contractual maturities of both the interest and principal portion of financial liabilities. All amounts contractually denominated in foreign currency are presented in Canadian dollar equivalent amounts using the period-end spot rate or floating rate.
As at September 30, 2025
Carrying amount
Contractual cash flows
Less than
one year
Between one and
three years
Between
three and five years
Beyond
five years
$
$
$
$
$
$
Non-derivative financial liabilities
Accounts payable and accrued liabilities 1,014,834  1,014,834  1,014,834  —  —  — 
Accrued compensation and employee-related
   liabilities
1,269,767  1,269,767  1,269,767  —  —  — 
2021 U.S. Senior Notes 1,386,564  1,481,011  859,688  25,633  25,633  570,057 
2021 CAD Senior Notes 597,892  637,380  12,180  625,200  —  — 
2024 CAD Senior Notes 747,001  846,508  28,562  349,284  468,662  — 
2025 U.S. Senior Notes 894,509  1,105,226  42,831  89,646  972,749  — 
Lease liabilities 693,484  779,572  197,735  296,202  177,385  108,250 
Other long-term debt 11,869  12,016  11,147  570  204  95 
Clients’ funds obligations 973,673  973,673  973,673  —  —  — 
Derivative financial liabilities
Cash flow hedges of future revenue 58,536 
Outflow
1,602,133  505,880  845,772  250,481  — 
(Inflow)
(1,632,658) (492,218) (865,405) (275,035) — 
Cross-currency swaps 139,191 
Outflow
2,797,646  133,358  1,127,564  1,499,067  37,657 
(Inflow)
(2,691,418) (153,134) (1,059,582) (1,442,517) (36,185)
7,787,320  8,195,690  4,404,303  1,434,884  1,676,629  679,874 

As at September 30, 2024
Carrying amount
Contractual cash flows
Less than
one year
Between one and
three years
Between
three and five years
Beyond
five years
$
$
$
$
$
$
Non-derivative financial liabilities
Accounts payable and accrued liabilities 999,790  999,790  999,790  —  —  — 
Accrued compensation and employee-related
   liabilities
1,165,903  1,165,903  1,165,903  —  —  — 
2021 U.S. Senior Notes 1,342,758  1,462,053  24,191  847,526  24,868  565,468 
2021 CAD Senior Notes 597,212  650,400  12,600  25,200  612,600  — 
2024 CAD Senior Notes 746,144  879,191  30,623  361,245  487,323  — 
Lease liabilities 620,095  697,298  173,061  254,475  166,326  103,436 
Other long-term debt 2,194  2,312  1,028  823  197  264 
Clients’ funds obligations 504,515  504,515  504,515  —  —  — 
Derivative financial liabilities
Cash flow hedges of future revenue 23,277 
Outflow 744,758  186,439  545,077  13,242  — 
(Inflow) (758,162) (175,510) (568,052) (14,600) — 
Cross-currency swaps 9,500 
Outflow 1,496,435  26,090  353,834  1,116,511  — 
(Inflow) (1,518,971) (40,681) (381,060) (1,097,230) — 
6,011,388  6,325,522  2,908,049  1,439,068  1,309,237  669,168 
Disclosure of analysis of age of trade accounts receivable
The following table sets forth details of the age of trade accounts receivable that are past due:
2025 2024
$
$
Not past due 1,195,658  1,005,651 
Past due 1-30 days 92,167  71,445 
Past due 31-60 days 24,089  18,352 
Past due 61-90 days 11,284  11,957 
Past due more than 90 days 26,238  13,367 
1,349,436  1,120,772 
Allowance for doubtful accounts (6,154) (3,060)
1,343,282  1,117,712