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Share-based compensation - Narratives (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 28, 2020
Mar. 30, 2019
Mar. 31, 2018
Dec. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award        
Share based compensation expense recognized $ 2.9 $ 2.6    
Proceeds from stock options exercised 2.1 1.2    
—Share options        
Share-based Compensation Arrangement by Share-based Payment Award        
Aggregate intrinsic value of options that were vested or expected to vest $ 2.5      
Contractual term of options that were vested or expect to vest 7 years 3 months 18 days      
Aggregate intrinsic value of options exercisable $ 1.9      
Contractual term of options exercisable 6 years      
Unrecognized compensation relating to non-vested awards $ 12.7      
Unrecognized compensation relating to non-vested awards, recognition period (term) 2 years 6 months      
Unrecognized compensation relating to non-vested awards recognizable upon liquidity $ 26.3      
Aggregate intrinsic value of options exercised $ 2.0 1.7    
—PRSUs        
Share-based Compensation Arrangement by Share-based Payment Award        
Unrecognized compensation relating to non-vested awards, recognition period (term) 2 years 6 months      
Unrecognized compensation relating to non-vested awards other than option $ 24.3      
RSU's and PRSU's        
Share-based Compensation Arrangement by Share-based Payment Award        
Unrecognized compensation relating to non-vested awards, recognition period (term) 2 years 6 months      
Unrecognized compensation relating to non-vested awards other than option $ 24.3      
Aggregate intrinsic value of non options vested $ 2.7 $ 0.2    
Omaha Topco Ltd. Stock Incentive Plan | Tranche One        
Share-based Compensation Arrangement by Share-based Payment Award        
Vesting percentage 20.00%      
Omaha Topco Ltd. Stock Incentive Plan | Tranche Two        
Share-based Compensation Arrangement by Share-based Payment Award        
Vesting percentage 20.00%      
Omaha Topco Ltd. Stock Incentive Plan | Tranche Three        
Share-based Compensation Arrangement by Share-based Payment Award        
Vesting percentage 20.00%      
Omaha Topco Ltd. Stock Incentive Plan | Tranche Four        
Share-based Compensation Arrangement by Share-based Payment Award        
Vesting percentage 20.00%      
Omaha Topco Ltd. Stock Incentive Plan | Tranche Five        
Share-based Compensation Arrangement by Share-based Payment Award        
Vesting percentage 20.00%      
Omaha Topco Ltd. Stock Incentive Plan | —RSUs        
Share-based Compensation Arrangement by Share-based Payment Award        
Vesting period       3 years
Shares granted (shares)       76,293
Term of award       10 years
Omaha Topco Ltd. Stock Incentive Plan | —Tier I | —Share options        
Share-based Compensation Arrangement by Share-based Payment Award        
Vesting period     5 years  
Gates Industrial Corporation Plc 2018 Omnibus Incentive Plan | —Share options | Minimum        
Share-based Compensation Arrangement by Share-based Payment Award        
Vesting period 3 years      
Gates Industrial Corporation Plc 2018 Omnibus Incentive Plan | —Share options | Maximum        
Share-based Compensation Arrangement by Share-based Payment Award        
Vesting period 4 years      
Gates Industrial Corporation Plc 2018 Omnibus Incentive Plan | —Share options | Tranche One | Minimum        
Share-based Compensation Arrangement by Share-based Payment Award        
Vesting percentage 33.00%      
Gates Industrial Corporation Plc 2018 Omnibus Incentive Plan | —Share options | Tranche One | Maximum        
Share-based Compensation Arrangement by Share-based Payment Award        
Vesting percentage 25.00%      
Gates Industrial Corporation Plc 2018 Omnibus Incentive Plan | —Share options | Tranche Two | Minimum        
Share-based Compensation Arrangement by Share-based Payment Award        
Vesting percentage 33.00%      
Gates Industrial Corporation Plc 2018 Omnibus Incentive Plan | —Share options | Tranche Two | Maximum        
Share-based Compensation Arrangement by Share-based Payment Award        
Vesting percentage 25.00%      
Gates Industrial Corporation Plc 2018 Omnibus Incentive Plan | —Share options | Tranche Three | Minimum        
Share-based Compensation Arrangement by Share-based Payment Award        
Vesting percentage 33.00%      
Gates Industrial Corporation Plc 2018 Omnibus Incentive Plan | —Share options | Tranche Three | Maximum        
Share-based Compensation Arrangement by Share-based Payment Award        
Vesting percentage 25.00%      
Gates Industrial Corporation Plc 2018 Omnibus Incentive Plan | —Share options | Tranche Four | Maximum        
Share-based Compensation Arrangement by Share-based Payment Award        
Vesting percentage 25.00%      
Gates Industrial Corporation Plc 2018 Omnibus Incentive Plan | —RSUs | Minimum        
Share-based Compensation Arrangement by Share-based Payment Award        
Vesting period 1 year      
Gates Industrial Corporation Plc 2018 Omnibus Incentive Plan | —RSUs | Maximum        
Share-based Compensation Arrangement by Share-based Payment Award        
Vesting period 3 years      
Gates Industrial Corporation Plc 2018 Omnibus Incentive Plan | —RSUs | Tranche One        
Share-based Compensation Arrangement by Share-based Payment Award        
Vesting percentage 33.00%      
Gates Industrial Corporation Plc 2018 Omnibus Incentive Plan | —RSUs | Tranche Two        
Share-based Compensation Arrangement by Share-based Payment Award        
Vesting percentage 33.00%      
Gates Industrial Corporation Plc 2018 Omnibus Incentive Plan | —RSUs | Tranche Three        
Share-based Compensation Arrangement by Share-based Payment Award        
Vesting percentage 33.00%      
Gates Industrial Corporation Plc 2018 Omnibus Incentive Plan | —PRSUs        
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 (percentage) 50.00%      
Percentage of shares expected to vest upon achievement of certain relative shareholders return (percentage) 50.00%      
Gates Industrial Corporation Plc 2018 Omnibus Incentive Plan | —PRSUs | Minimum        
Share-based Compensation Arrangement by Share-based Payment Award        
Vesting period 1 year      
Total number of shares expected to vest at term of award arrangement (percentage) 0.00%      
Gates Industrial Corporation Plc 2018 Omnibus Incentive Plan | —PRSUs | Maximum        
Share-based Compensation Arrangement by Share-based Payment Award        
Vesting period 3 years      
Total number of shares expected to vest at term of award arrangement (percentage) 200.00%      
Gates Industrial Corporation Plc 2018 Omnibus Incentive Plan | —PRSUs | Tranche One        
Share-based Compensation Arrangement by Share-based Payment Award        
Vesting percentage 33.00%      
Gates Industrial Corporation Plc 2018 Omnibus Incentive Plan | —PRSUs | Tranche Two        
Share-based Compensation Arrangement by Share-based Payment Award        
Vesting percentage 33.00%      
Gates Industrial Corporation Plc 2018 Omnibus Incentive Plan | —PRSUs | Tranche Three        
Share-based Compensation Arrangement by Share-based Payment Award        
Vesting percentage 33.00%      
Gates Industrial Corporation Plc 2018 Omnibus Incentive Plan | —SARs | Tranche One | Minimum        
Share-based Compensation Arrangement by Share-based Payment Award        
Vesting percentage 33.00%      
Gates Industrial Corporation Plc 2018 Omnibus Incentive Plan | —SARs | Tranche One | Maximum        
Share-based Compensation Arrangement by Share-based Payment Award        
Vesting percentage 25.00%      
Gates Industrial Corporation Plc 2018 Omnibus Incentive Plan | —SARs | Tranche Two | Minimum        
Share-based Compensation Arrangement by Share-based Payment Award        
Vesting percentage 33.00%      
Gates Industrial Corporation Plc 2018 Omnibus Incentive Plan | —SARs | Tranche Two | Maximum        
Share-based Compensation Arrangement by Share-based Payment Award        
Vesting percentage 25.00%      
Gates Industrial Corporation Plc 2018 Omnibus Incentive Plan | —SARs | Tranche Three | Minimum        
Share-based Compensation Arrangement by Share-based Payment Award        
Vesting percentage 33.00%      
Gates Industrial Corporation Plc 2018 Omnibus Incentive Plan | —SARs | Tranche Three | Maximum        
Share-based Compensation Arrangement by Share-based Payment Award        
Vesting percentage 25.00%      
Gates Industrial Corporation Plc 2018 Omnibus Incentive Plan | —SARs | Tranche Four | Maximum        
Share-based Compensation Arrangement by Share-based Payment Award        
Vesting percentage 25.00%      
Gates Industrial Corporation Plc 2018 Omnibus Incentive Plan | —Premium-priced options        
Share-based Compensation Arrangement by Share-based Payment Award        
Vesting period 3 years      
Term of award 10 years      
Gates Industrial Corporation Plc 2018 Omnibus Incentive Plan | —Premium-priced options | Tranche One        
Share-based Compensation Arrangement by Share-based Payment Award        
Vesting percentage 33.00%      
Gates Industrial Corporation Plc 2018 Omnibus Incentive Plan | —Premium-priced options | Tranche Two        
Share-based Compensation Arrangement by Share-based Payment Award        
Vesting percentage 33.00%      
Gates Industrial Corporation Plc 2018 Omnibus Incentive Plan | —Premium-priced options | Tranche Three        
Share-based Compensation Arrangement by Share-based Payment Award        
Vesting percentage 33.00%