Share-based compensation (Tables)

3 Months Ended

Mar. 30, 2024

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

		Three Months Ended March 30, 2024
	Plan	Number of options	Weighted average exercise price $
Outstanding at the beginning of the period:
—Tier I	2014 Plan	1,828,327	$	6.98
—Tier II	2014 Plan	1,996,017	$	7.01
—Tier IV	2014 Plan	1,986,416	$	10.52
—SARs	Both plans	735,221	$	10.47
—Share options	2018 Plan	2,345,520	$	14.90
—Premium-priced options	2018 Plan	835,469	$	18.88
		9,726,970	$	10.90
Granted during the period:
—SARs	2018 Plan	22,100	$	14.87
		22,100	$	14.87
Forfeited during the period:
—SARs	2018 Plan	(3,001)	$	13.40
		(3,001)	$	13.40
Expired during the period:
—Share options	2018 Plan	(15,000)	$	14.99
		(15,000)	$	14.99
Exercised during the period:
—Tier I	2014 Plan	(95,237)	$	6.80
—Tier II	2014 Plan	(84,642)	$	6.88
—Tier IV	2014 Plan	(71,783)	$	10.32
—SARs	Both Plans	(134,766)	$	9.23
—Share options	2018 Plan	(37,081)	$	14.05
		(423,509)	$	8.82
Outstanding at the end of the period:
—Tier I	2014 Plan	1,733,090	$	6.99
—Tier II	2014 Plan	1,911,375	$	7.02
—Tier IV	2014 Plan	1,914,633	$	10.53
—SARs	Both plans	619,554	$	10.88
—Share options	2018 Plan	2,293,439	$	14.91
—Premium-priced options	2018 Plan	835,469	$	18.88
		9,307,560	$	11.00
Exercisable at the end of the period		9,215,590	$	10.96
Vested and expected to vest at the end of the period		9,295,189	$	10.99

Schedule of RSU and PRSU Activity

Summary of movements in RSUs and PRSUs outstanding

	Three Months Ended March 30, 2024
	Number of awards	Weighted average grant date fair value $
Outstanding at the beginning of the period:
—RSUs	3,032,230	$	13.78
—PRSUs	917,661	$	16.77
	3,949,891	$	14.47
Granted during the period:
—RSUs	1,151,752	$	14.87
—PRSUs	426,607	$	16.37
	1,578,359	$	15.27
Forfeited during the period:
—RSUs	(15,201)	$	14.63
—PRSUs	(86,680)	$	15.26
	(101,881)	$	15.16
Vested during the period:
—RSUs	(862,708)	$	14.84
—PRSUs	(154,274)	15.00
	(1,016,982)	$	14.86
Outstanding at the end of the period:
—RSUs	3,306,073	$	13.88
—PRSUs	1,103,314	$	16.98
	4,409,387	$	14.66

Schedule of Share Based Compensation Valuation Techniques

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

	Three months ended
	March 30, 2024			April 1, 2023
Weighted average grant date fair value:
—SARs	$	6.95		$	6.71
—RSUs	$	14.87		$	14.06
—PRSUs	$	16.37		$	15.88
Inputs to the model:
—Expected volatility — SARs	41.7		%	43.4		%
—Expected volatility — PRSUs	31.6		%	37.7		%
—Expected option life for SARs (years)	6.0			6.0
—Risk-free interest rate:
SARs	4.2		%	4.1		%
PRSUs	4.4		%	4.6		%