v3.25.1
Share-based compensation - Narratives (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Mar. 29, 2025
Mar. 30, 2024
Jul. 02, 2022
Share-based Compensation Arrangement by Share-based Payment Award      
Share based compensation expense recognized $ 6.1 $ 8.6  
Proceeds from stock options exercised 1.8 2.5  
—Share options      
Share-based Compensation Arrangement by Share-based Payment Award      
Aggregate intrinsic value of options exercisable $ 35.9    
Contractual term of options exercisable (in years) 2 years 8 months 12 days    
Aggregate intrinsic value of options that were vested or expected to vest $ 36.0    
Contractual term of options that were vested or expect to vest (in years) 2 years 9 months 18 days    
Unrecognized compensation relating to non-vested awards $ 0.3    
Unrecognized compensation relating to non-vested awards, recognition period (in years) 2 years 1 month 6 days    
Aggregate intrinsic value of options exercised $ 13.9 1.8  
—Share options | Omaha Topco Ltd. Stock Incentive Plan | —Tier I      
Share-based Compensation Arrangement by Share-based Payment Award      
Term of award (in years) 10 years    
—Share options | Gates Industrial Corporation Plc 2018 Omnibus Incentive Plan | Minimum      
Share-based Compensation Arrangement by Share-based Payment Award      
Vesting period (in years) 3 years    
—Share options | Gates Industrial Corporation Plc 2018 Omnibus Incentive Plan | Maximum      
Share-based Compensation Arrangement by Share-based Payment Award      
Vesting period (in years) 4 years    
—Premium-priced options | Gates Industrial Corporation Plc 2018 Omnibus Incentive Plan      
Share-based Compensation Arrangement by Share-based Payment Award      
Term of award (in years) 10 years    
Vesting period (in years) 3 years    
Post grant date start date (in years) 2 years    
—RSUs | Gates Industrial Corporation Plc 2018 Omnibus Incentive Plan | Minimum      
Share-based Compensation Arrangement by Share-based Payment Award      
Vesting period (in years) 1 year    
—RSUs | Gates Industrial Corporation Plc 2018 Omnibus Incentive Plan | Maximum      
Share-based Compensation Arrangement by Share-based Payment Award      
Vesting period (in years) 3 years    
—PRSUs | Gates Industrial Corporation Plc 2018 Omnibus Incentive Plan      
Share-based Compensation Arrangement by Share-based Payment Award      
Percentage of shares expected to vest upon achievement of average annual adjusted return on invested capital (as a percent) 75.00%    
Percentage of shares expected to vest upon achievement of certain relative shareholders return (as a percent) 25.00%    
Performance period (in years)     3 years
—PRSUs | Gates Industrial Corporation Plc 2018 Omnibus Incentive Plan | Minimum      
Share-based Compensation Arrangement by Share-based Payment Award      
Vesting period (in years) 1 year    
Total number of shares expected to vest at term of award arrangement (as a percent) 0.00%    
—PRSUs | Gates Industrial Corporation Plc 2018 Omnibus Incentive Plan | Maximum      
Share-based Compensation Arrangement by Share-based Payment Award      
Vesting period (in years) 3 years    
Total number of shares expected to vest at term of award arrangement (as a percent) 200.00%    
RSU's and PRSU's      
Share-based Compensation Arrangement by Share-based Payment Award      
Unrecognized compensation relating to non-vested awards, recognition period (in years) 1 year 9 months 18 days    
Unrecognized compensation relating to non-vested awards other than option $ 42.1    
Aggregate intrinsic value of non options vested $ 20.5 $ 15.1