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Financial instruments (Tables)

12 Months Ended

Sep. 30, 2024

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, 2024						As at September 30, 2023
			Level			Carrying amount			Fair value			Carrying amount			Fair value
						$			$			$			$
2014 U.S. Senior Notes			Level 2			—			—			473,808			464,806
2021 U.S. Senior Notes			Level 2			1,342,758			1,223,120			1,342,714			1,132,649
2021 CAD Senior Notes			Level 2			597,212			564,768			596,550			503,984
2024 CAD Senior Notes			Level 2			746,144			759,375			—			—
Other long-term debt			Level 2			2,194			2,119			10,363			9,839
						2,688,308			2,549,382			2,423,435			2,111,278

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, 2024						As at September 30, 2023
						$						$
Financial assets
FVTE
Cash and cash equivalents			Level 2						1,461,145						1,568,291
Cash included in funds held for clients (Note 5)			Level 2						233,584						269,792
Deferred compensation plan assets (Note 11)			Level 1						112,270						88,076
									1,806,999						1,926,159
Derivative financial instruments designated as      hedging instruments
Current derivative financial instruments included in current financial assets			Level 2
Cross-currency swaps									—						83,626
Foreign currency forward contracts									5,055						12,505
Long-term derivative financial instruments (Note 11)			Level 2
Cross-currency swaps									—						16,130
Foreign currency forward contracts									2,644						5,875
									7,699						118,136
FVOCI
Short-term investments included in current financial assets			Level 2						3,279						7,332
Long-term bonds included in funds held for clients (Note 5)			Level 2						223,196						138,935
Long-term investments (Note 11)			Level 2						24,209						17,113
									250,684						163,380
Financial liabilities
Derivative financial instruments designated as       hedging instruments
Current derivative financial instruments			Level 2
Cross-currency swaps									—						2,183
Foreign currency forward contracts									13,073						2,330
Long-term derivative financial instruments			Level 2
Cross-currency swaps									9,500						—
Foreign currency forward contracts									10,204						1,700
									32,777						6,213

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, 2024						As at September 30, 2023
						$						$
Financial assets
FVTE
Cash and cash equivalents			Level 2						1,461,145						1,568,291
Cash included in funds held for clients (Note 5)			Level 2						233,584						269,792
Deferred compensation plan assets (Note 11)			Level 1						112,270						88,076
									1,806,999						1,926,159
Derivative financial instruments designated as      hedging instruments
Current derivative financial instruments included in current financial assets			Level 2
Cross-currency swaps									—						83,626
Foreign currency forward contracts									5,055						12,505
Long-term derivative financial instruments (Note 11)			Level 2
Cross-currency swaps									—						16,130
Foreign currency forward contracts									2,644						5,875
									7,699						118,136
FVOCI
Short-term investments included in current financial assets			Level 2						3,279						7,332
Long-term bonds included in funds held for clients (Note 5)			Level 2						223,196						138,935
Long-term investments (Note 11)			Level 2						24,209						17,113
									250,684						163,380
Financial liabilities
Derivative financial instruments designated as       hedging instruments
Current derivative financial instruments			Level 2
Cross-currency swaps									—						2,183
Foreign currency forward contracts									13,073						2,330
Long-term derivative financial instruments			Level 2
Cross-currency swaps									9,500						—
Foreign currency forward contracts									10,204						1,700
									32,777						6,213

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, 2024			As at September 30, 2023
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			(7,806)			22,966
$136,274			From 3.57% to 3.63%			£75,842			From 2.67% to 2.80%			September 2024			—			11,972
$80,000			4.15%			kr609,940			From 3.49% to 3.51%			September 2029			(1,694)			12,087
Hedges of net investments in European operations and cash flow hedges on unsecured committed term loan credit facility
U.S.$500,000			SOFR 1 month +1.10%			€443,381			From 1.14% to 1.22%			December 2023			—			44,386
Cash flow hedges of 2014 U.S. Senior Notes
U.S.$215,000			From 3.74% to 4.06%			$284,793			From 3.49% to 3.81%			September 2024			—			6,163
Total															(9,500)			97,574

Disclosure of notional, average contract rates, maturities and sensitivity analysis for currency risk

As at September 30, 2024, 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, 2024			As at September 30, 2023
Foreign currency forward contracts			Notional			Less than one year			More than one year			Fair value			Fair value
												$			$
USD/INR			U.S.$359,901			85.23			88.92			2,091			(973)
CAD/INR			$381,045			64.11			65.75			314			4,497
EUR/INR			€112,863			94.45			99.84			(1,156)			5,076
GBP/INR			£107,169			106.93			112.11			(8,700)			3,501
SEK/INR			kr157,427			8.18			8.67			(720)			(33)
GBP/EUR			£202,819			1.18			—			(5,763)			649
EUR/MAD			€22,947			10.66			—			(548)			135
EUR/CZK			€16,771			24.64			25.05			(473)			(92)
Others			$65,784									(623)			1,590
Total												(15,578)			14,350

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.

												2024												2023
			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			150			1,359			1,179			521			1,384			3,598			692			466
Decrease in other    comprehensive income (loss)			(174,239)			(180,405)			(17,269)			(9,631)			(155,000)			(190,539)			(29,436)			(7,005)

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, 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

As at September 30, 2023			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			924,659			924,659			924,659			—			—			—
Accrued compensation and employee-related    liabilities			1,100,566			1,100,566			1,100,566			—			—			—
2014 U.S. Senior Notes			473,808			492,722			492,722			—			—			—
2021 U.S. Senior Notes			1,342,714			1,488,774			24,233			860,746			24,910			578,885
2021 CAD Senior Notes			596,550			663,000			12,600			25,200			625,200			—
Unsecured committed term loan credit    facility			676,886			687,419			687,419			—			—			—
Lease liabilities			641,963			722,284			221,877			238,009			139,275			123,123
Other long-term debt			10,363			10,448			8,353			1,328			449			318
Clients’ funds obligations			493,638			493,638			493,638			—			—			—
Derivative financial liabilities
Cash flow hedges of future revenue			4,030
Outflow						328,455			155,450			163,091			9,914			—
(Inflow)						(331,954)			(154,116)			(166,967)			(10,871)			—
Cross-currency swaps			2,183
Outflow						93,311			93,311			—			—			—
(Inflow)						(91,353)			(91,353)			—			—			—
			6,267,360			6,581,969			3,969,359			1,121,407			788,877			702,326

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, 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

As at September 30, 2023			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			924,659			924,659			924,659			—			—			—
Accrued compensation and employee-related    liabilities			1,100,566			1,100,566			1,100,566			—			—			—
2014 U.S. Senior Notes			473,808			492,722			492,722			—			—			—
2021 U.S. Senior Notes			1,342,714			1,488,774			24,233			860,746			24,910			578,885
2021 CAD Senior Notes			596,550			663,000			12,600			25,200			625,200			—
Unsecured committed term loan credit    facility			676,886			687,419			687,419			—			—			—
Lease liabilities			641,963			722,284			221,877			238,009			139,275			123,123
Other long-term debt			10,363			10,448			8,353			1,328			449			318
Clients’ funds obligations			493,638			493,638			493,638			—			—			—
Derivative financial liabilities
Cash flow hedges of future revenue			4,030
Outflow						328,455			155,450			163,091			9,914			—
(Inflow)						(331,954)			(154,116)			(166,967)			(10,871)			—
Cross-currency swaps			2,183
Outflow						93,311			93,311			—			—			—
(Inflow)						(91,353)			(91,353)			—			—			—
			6,267,360			6,581,969			3,969,359			1,121,407			788,877			702,326

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:

									2024			2023
									$			$
Not past due									1,005,651			1,034,795
Past due 1-30 days									71,445			82,536
Past due 31-60 days									18,352			17,630
Past due 61-90 days									11,957			9,925
Past due more than 90 days									13,367			10,913
									1,120,772			1,155,799
Allowance for doubtful accounts									(3,060)			(2,919)
									1,117,712			1,152,880

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The disclosure of detailed information about hedging instruments. [Refer: Hedging instruments [domain]]

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The disclosure of a maturity analysis for derivative financial liabilities, including the remaining contractual maturities for those derivative financial liabilities for which contractual maturities are essential for an understanding of the timing of the cash flows. [Refer: Derivative financial liabilities]

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The disclosure of a maturity analysis for non-derivative financial liabilities (including issued financial guarantee contracts) that shows the remaining contractual maturities. [Refer: Derivative financial liabilities]

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The disclosure of the sensitivity analysis for types of market risk to which the entity is exposed, showing how profit or loss and equity would have been affected by changes in the relevant risk variable that were reasonably possible at that date. [Refer: Market risk [member]]

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