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Goodwill and other identifiable intangible assets - Additional Information (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 28, 2021
Mar. 29, 2020
Goodwill and Intangible Assets Disclosure [Abstract]    
Amortization of intangible assets $ 0.2 $ 0.2
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity    
2021 0.5  
2022 0.7  
2023 0.7  
2024 0.7  
2025 0.7  
2026 $ 0.7