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Debt - Schedule of Debt Outstanding (Details) - USD ($)
Sep. 27, 2020
Dec. 31, 2019
Debt Instrument [Line Items]    
Long-term debt, gross $ 75,000,000.0  
Unamortized debt issuance costs (300,000) $ (1,100,000)
Total debt 74,700,000 91,400,000
Less current portion (25,000,000.0) 0
Non-current debt 49,700,000 91,400,000
Revolving credit facility    
Debt Instrument [Line Items]    
Long-term debt, gross 0 17,500,000
Unamortized debt issuance costs 0  
Loan Notes | 3.67% Loan Notes due 2021    
Debt Instrument [Line Items]    
Long-term debt, gross $ 25,000,000.0 25,000,000.0
Debt stated interest rate 3.67%  
Loan Notes | 4.88% Loan Notes due 2023    
Debt Instrument [Line Items]    
Long-term debt, gross $ 25,000,000.0 25,000,000.0
Debt stated interest rate 4.88%  
Loan Notes | 4.94% Loan Notes due 2026    
Debt Instrument [Line Items]    
Long-term debt, gross $ 25,000,000.0 $ 25,000,000.0
Debt stated interest rate 4.94%