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Share-based compensation (Tables)

6 Months Ended

Jun. 28, 2025

Share-Based Payment Arrangement [Abstract]

Schedule of Stock Option Activity

New awards and movements in existing awards granted under this plan are summarized in the tables below.

Summary of movements in options outstanding

						Six months ended June 28, 2025
			Plan			Number of options						Weighted average exercise price $
Outstanding at the beginning of the period:
—Tier I			2014 Plan			1,557,018						$	6.95
—Tier II			2014 Plan			1,722,639						$	7.00
—Tier IV			2014 Plan			1,660,742						$	10.48
—SARs			Both plans			603,393						$	10.79
—Share options			2018 Plan			1,480,065						$	14.56
—Premium-priced options			2018 Plan			835,469						$	18.88
						7,859,326						$	10.70
Granted during the period:
—SARs			2018 Plan			29,100						$	21.64
						29,100						$	21.64
Forfeited during the period:
—SARs			2018 Plan			(2,834)						$	17.61
						(2,834)						$	17.61
Exercised during the period:
—Tier I			2014 Plan			(1,212,124)						$	6.71
—Tier II			2014 Plan			(1,208,634)						$	6.68
—Tier IV			2014 Plan			(1,199,630)						$	10.02
—SARs			Both Plans			(112,604)						$	10.96
—Share options			2018 Plan			(119,790)						$	14.79
						(3,852,782)						$	8.11
Outstanding at the end of the period:
—Tier I			2014 Plan			344,894						$	7.78
—Tier II			2014 Plan			514,005						$	7.76
—Tier IV			2014 Plan			461,112						$	11.68
—SARs			Both plans			517,055						$	11.33
—Share options			2018 Plan			1,360,275						$	14.54
—Premium-priced options			2018 Plan			835,469						$	18.88
						4,032,810						$	13.26
Exercisable at the end of the period						3,967,619						$	13.18
Vested and expected to vest at the end of the period						4,032,810						$	13.25

Schedule of RSU and PRSU Activity

Summary of movements in RSUs and PRSUs outstanding

			Six months ended June 28, 2025
			Number of awards						Weighted average grant date fair value $
Outstanding at the beginning of the period:
—RSUs			2,570,852						$	14.45
—PRSUs			1,028,146						$	17.03
			3,598,998						$	15.19
Granted during the period:
—RSUs			863,518						$	21.60
—PRSUs			279,404						$	23.55
			1,142,922						$	22.08
Adjusted for performance during the period:
—PRSUs			60,274						$	17.23
			60,274						$	17.23
Forfeited during the period:
—RSUs			(89,303)						$	14.41
—PRSUs			(34,726)						$	16.10
			(124,029)						$	14.88
Vested during the period:
—RSUs			(993,109)						$	14.85
—PRSUs			(347,337)						17.23
			(1,340,446)						$	15.46
Outstanding at the end of the period:
—RSUs			2,351,958						$	16.91
—PRSUs			985,761						$	18.85
			3,337,719						$	17.48

Schedule of Share Based Compensation Valuation Techniques

The weighted average fair values and relevant assumptions were as follows:

			Six months ended
			June 28, 2025						June 29, 2024
Weighted average grant date fair value:
—SARs			$	9.96					$	6.95
—RSUs			$	21.60					$	14.91
—PRSUs			$	23.55					$	16.37
Inputs to the model:
—Expected volatility — SARs			41.1		%				41.7		%
—Expected volatility — PRSUs			31.6		%				31.6		%
—Expected option life for SARs (years)			6.0						6.0
—Risk-free interest rate:
SARs			4.1		%				4.2		%
PRSUs			4.0		%				4.4		%

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Tabular disclosure of the changes in outstanding nonvested shares.

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Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value.

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Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions.

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