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Debt - Schedule of Debt Outstanding (Details) - USD ($)
Sep. 29, 2019
Dec. 31, 2018
Debt Instrument [Line Items]    
Long-term debt $ 106,700,000  
Unamortized debt issuance costs (1,100,000) $ (1,400,000)
Total debt 105,600,000 77,100,000
Less current portion 0 (3,500,000)
Non-current debt 105,600,000 73,600,000
Other - Bank overdraft    
Debt Instrument [Line Items]    
Long-term debt 0 3,500,000
Loan Notes | Loan Notes due 2021    
Debt Instrument [Line Items]    
Long-term debt $ 25,000,000 25,000,000
Debt stated interest rate 3.67%  
Loan Notes | Loan Notes due 2023    
Debt Instrument [Line Items]    
Long-term debt $ 25,000,000 25,000,000
Debt stated interest rate 4.88%  
Loan Notes | Loan Notes due 2026    
Debt Instrument [Line Items]    
Long-term debt $ 25,000,000 25,000,000
Debt stated interest rate 4.94%  
Revolving credit facility    
Debt Instrument [Line Items]    
Long-term debt $ 31,700,000 $ 0