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Share-based payments (Tables)
 12 Months Ended
Sep. 30, 2023
Share-Based Payment Arrangements [Abstract]  
Disclosure of information concerning PSUs
The following table presents information concerning the number of outstanding PSUs granted by the Company:
 Outstanding as at September 30, 2021 1,416,203 
 Granted1
 805,699 
 Exercised (Note 19)
 (237,294)
 Forfeited (175,017)
 Outstanding as at September 30, 2022 1,809,591 
 Granted1
 899,511 
 Exercised (Note 19)
 (294,203)
 Forfeited (162,449)
 Outstanding as at September 30, 2023 2,252,450 
1    The PSUs granted in 2023 had a weighted average grant date fair value of $112.49 per unit ($109.07 in 2022).
Disclosure of information concerning outstanding stock options
The following table presents information concerning the outstanding stock options granted by the Company:
2023 2022
Number of options Weighted
average exercise
price per share		 Number of options Weighted
average exercise price per share
$ $
 Outstanding, beginning of year 6,882,845  66.36  8,012,077  64.49 
 Granted —  —  11,940  110.10 
 Exercised (Note 19)
 (1,646,044) 53.65  (941,059) 44.30 
 Forfeited (23,626) 99.78  (188,130) 97.55 
 Expired (1,703) 102.70  (11,983) 104.36 
 Outstanding, end of year 5,211,472  70.21  6,882,845  66.36 
 Exercisable, end of year 4,772,088  67.46  5,837,921  61.02 
Disclosure of range of exercise prices of outstanding stock options
The following table summarizes information about the outstanding stock options granted by the Company as at September 30, 2023:
Options outstanding Options exercisable
Range of
exercise price		 Number of options Weighted
average
remaining contractual life 		Weighted
average exercise price		 Number of options Weighted average exercise price
$ (in years) $ $
 34.68 to 41.63
 550,083  0.90 38.36  550,083  38.36 
 47.36 to 52.63
 590,495  1.98 48.39  590,495  48.39 
55.51 to 63.23
 2,052,950  3.22 63.19  2,052,950  63.19 
 67.04 to 85.62
 1,078,428  4.94 84.51  1,078,428  84.51 
97.84 to 115.01
 939,516  6.93 101.51  500,132  102.73 
5,211,472  3.86 70.21  4,772,088  67.46 
Disclosure of number of options and weighted average remaining contractual life
The following table summarizes information about the outstanding stock options granted by the Company as at September 30, 2023:
Options outstanding Options exercisable
Range of
exercise price		 Number of options Weighted
average
remaining contractual life 		Weighted
average exercise price		 Number of options Weighted average exercise price
$ (in years) $ $
 34.68 to 41.63
 550,083  0.90 38.36  550,083  38.36 
 47.36 to 52.63
 590,495  1.98 48.39  590,495  48.39 
55.51 to 63.23
 2,052,950  3.22 63.19  2,052,950  63.19 
 67.04 to 85.62
 1,078,428  4.94 84.51  1,078,428  84.51 
97.84 to 115.01
 939,516  6.93 101.51  500,132  102.73 
5,211,472  3.86 70.21  4,772,088  67.46 
Disclosure of weighted average assumptions used in the calculation of fair value of stock options
The weighted average fair value of stock options granted in the year and the weighted average assumptions used in the calculation of their fair value on the date of grant using the Black-Scholes option pricing model were as follows:
Year ended September 30
2023 2022
 Grant date fair value ($) —  20.94 
 Dividend yield (%) —  — 
 Expected volatility (%)1
 —  21.27 
 Risk-free interest rate (%) —  1.28 
 Expected life (years) —  4.00 
 Exercise price ($) —  110.10 
 Share price ($) —  110.10 
1    Expected volatility was determined using statistical formulas and based on the weekly historical average of closing daily share prices over the period of the expected life of stock options.
Disclosure of share-based payment expense
The share-based payment expense recorded in costs of services, selling and administrative is as follows:
Year ended September 30
2023 2022
$ $
 PSUs 55,847  42,148 
 Stock options 2,367  6,848 
 Share purchase plan 169,418  136,275 
 DSUs 5,332  1,455 
232,964  186,726