Share-based compensation - Narratives (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended |
Mar. 30, 2019 | Mar. 31, 2018 | Dec. 30, 2017 |
Share-based Compensation Arrangement by Share-based Payment Award | | | |
Share based compensation expense recognized | $ 2.6 | $ 1.6 | |
Unrecognized compensation relating to non-vested awards, recognition period (term) | 2 years 8 months 12 days | | |
Proceeds from stock options exercised | $ 1.2 | | |
Unrecognized compensation relating to non-vested awards other than option | 15.8 | | |
Aggregate intrinsic value of non options vested | 0.2 | | |
—Share options | | | |
Share-based Compensation Arrangement by Share-based Payment Award | | | |
Unrecognized compensation relating to non-vested awards | $ 15.9 | | |
Unrecognized compensation relating to non-vested awards, recognition period (term) | 3 years 2 months | | |
Unrecognized compensation relating to non-vested awards recognizable upon liquidity | $ 29.9 | | |
Aggregate intrinsic value of options exercised | 1.7 | | |
Aggregate intrinsic value of options vested and exercisable | $ 16.1 | | |
Remaining contractual term for options vested and exercisable (term) | 6 years 6 months | | |
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 | —Share options | —Tier I | | | |
Share-based Compensation Arrangement by Share-based Payment Award | | | |
Vesting period | 5 years | | |
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 | | |
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 | 33.33% | | |
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 | 33.33% | | |
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 | 33.33% | | |
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 | 33.33% | | |
Gates Industrial Corporation plc 2018 Omnibus Incentive Plan | —RSUs | Tranche Two | | | |
Share-based Compensation Arrangement by Share-based Payment Award | | | |
Vesting percentage | 33.33% | | |
Gates Industrial Corporation plc 2018 Omnibus Incentive Plan | —RSUs | Tranche Three | | | |
Share-based Compensation Arrangement by Share-based Payment Award | | | |
Vesting percentage | 33.33% | | |
Gates Industrial Corporation plc 2018 Omnibus Incentive Plan | —PRSUs | Minimum | | | |
Share-based Compensation Arrangement by Share-based Payment Award | | | |
Vesting period | 1 year | | |
Gates Industrial Corporation plc 2018 Omnibus Incentive Plan | —PRSUs | Maximum | | | |
Share-based Compensation Arrangement by Share-based Payment Award | | | |
Vesting period | 3 years | | |
Gates Industrial Corporation plc 2018 Omnibus Incentive Plan | —PRSUs | Tranche One | | | |
Share-based Compensation Arrangement by Share-based Payment Award | | | |
Vesting percentage | 33.33% | | |
Gates Industrial Corporation plc 2018 Omnibus Incentive Plan | —PRSUs | Tranche Two | | | |
Share-based Compensation Arrangement by Share-based Payment Award | | | |
Vesting percentage | 33.33% | | |
Gates Industrial Corporation plc 2018 Omnibus Incentive Plan | —PRSUs | Tranche Three | | | |
Share-based Compensation Arrangement by Share-based Payment Award | | | |
Vesting percentage | 33.33% | | |
Gates Industrial Corporation plc 2018 Omnibus Incentive Plan | —SARs | Minimum | | | |
Share-based Compensation Arrangement by Share-based Payment Award | | | |
Vesting period | 3 years | | |
Gates Industrial Corporation plc 2018 Omnibus Incentive Plan | —SARs | Maximum | | | |
Share-based Compensation Arrangement by Share-based Payment Award | | | |
Vesting period | 4 years | | |
Gates Industrial Corporation plc 2018 Omnibus Incentive Plan | —SARs | Tranche One | Minimum | | | |
Share-based Compensation Arrangement by Share-based Payment Award | | | |
Vesting percentage | 33.33% | | |
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 | 33.33% | | |
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 | 33.33% | | |
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 | Minimum | | | |
Share-based Compensation Arrangement by Share-based Payment Award | | | |
Total number of shares expected to vest at term of award arrangement (percentage) | 0.00% | | |
Gates Industrial Corporation plc 2018 Omnibus Incentive Plan | —Premium-priced options | Maximum | | | |
Share-based Compensation Arrangement by Share-based Payment Award | | | |
Total number of shares expected to vest at term of award arrangement (percentage) | 200.00% | | |
Gates Industrial Corporation plc 2018 Omnibus Incentive Plan | —Premium-priced options | Tranche One | | | |
Share-based Compensation Arrangement by Share-based Payment Award | | | |
Vesting percentage | 33.33% | | |
Gates Industrial Corporation plc 2018 Omnibus Incentive Plan | —Premium-priced options | Tranche Two | | | |
Share-based Compensation Arrangement by Share-based Payment Award | | | |
Vesting percentage | 33.33% | | |
Gates Industrial Corporation plc 2018 Omnibus Incentive Plan | —Premium-priced options | Tranche Three | | | |
Share-based Compensation Arrangement by Share-based Payment Award | | | |
Vesting percentage | 33.33% | | |