Share-based compensation - Fair Value and Valuation Assumptions (Details) - $ / shares	6 Months Ended
	Jun. 28, 2025	Jun. 29, 2024
—SARs
Share-based Compensation Arrangement by Share-based Payment Award
Weighted average grant date fair value (in usd per share)	$ 9.96	$ 6.95
Expected volatility (as a percent)	41.10%	41.70%
Expected option life (in years)	6 years	6 years
Risk-free interest rate (as a percent)	4.10%	4.20%
—RSUs
Share-based Compensation Arrangement by Share-based Payment Award
Weighted average grant date fair value (in usd per share)	$ 21.60	$ 14.91
—PRSUs
Share-based Compensation Arrangement by Share-based Payment Award
Weighted average grant date fair value (in usd per share)	$ 23.55	$ 16.37
Expected volatility (as a percent)	31.60%	31.60%
Risk-free interest rate (as a percent)	4.00%	4.40%

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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+ Details

Gates Industrial Corp plc 10-Q