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Share-based payments (Tables)
 12 Months Ended
Sep. 30, 2025
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 under the Share Unit Plan:
 Outstanding as at September 30, 2023 2,252,450 
 Granted1
 799,418 
 Exercised (Note 19)
 (280,265)
 Forfeited (243,403)
 Outstanding as at September 30, 2024 2,528,200 
 Granted1
 674,259 
 Exercised (Note 19)
 (765,318)
 Forfeited (418,173)
 Dividends 8,588 
 Outstanding as at September 30, 2025 2,027,556 
1    The PSUs granted in 2025 had a weighted average grant date fair value of $159.44 per unit ($137.90 in 2024).
Disclosure of information concerning outstanding stock options
The following table presents information concerning the outstanding stock options granted by the Company:
2025 2024
Number of options Weighted
average exercise
price per share		 Number of options Weighted
average exercise price per share
$ $
 Outstanding, beginning of year 3,862,527  74.53  5,211,472  70.21 
 Exercised (Note 19)
 (947,071) 65.45  (1,333,876) 57.38 
 Forfeited —  —  (12,575) 97.84 
 Expired (2,983) 84.91  (2,494) 98.65 
 Outstanding, end of year 2,912,473  77.48  3,862,527  74.53 
 Exercisable, end of year 2,912,473  77.48  3,699,805  73.51 
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, 2025:
Options outstanding and exercisable
Range of
exercise price		 Number of options Weighted
average
remaining contractual life 		Weighted
average exercise price
$ (in years) $
 47.81 to 52.63
 43,095  0.02 49.10 
 57.21 to 63.23
 1,391,588  1.51 63.22 
67.04 to 85.62
 847,418  2.93 84.47 
97.84 to 110.73
 630,372  4.93 101.50 
2,912,473  2.64 77.48
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, 2025:
Options outstanding and exercisable
Range of
exercise price		 Number of options Weighted
average
remaining contractual life 		Weighted
average exercise price
$ (in years) $
 47.81 to 52.63
 43,095  0.02 49.10 
 57.21 to 63.23
 1,391,588  1.51 63.22 
67.04 to 85.62
 847,418  2.93 84.47 
97.84 to 110.73
 630,372  4.93 101.50 
2,912,473  2.64 77.48
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
2025 2024
$ $
 PSUs 68,636  67,054 
 Stock options —  786 
 Share purchase plan 196,510  181,989 
 DSUs (743) 4,384 
264,403  254,213