Fair Value Measurements of Financial Instruments (Details) - USD ($) $ in Thousands	Dec. 28, 2019	Dec. 29, 2018
Fair Value Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	$ 52,073	$ 76,819
Fair Value measurements on a recurring basis
Fair Value Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	52,073	76,819
Derivative financial instruments	276	3,797
Deferred stock-based compensation	7,503	7,857
Fair Value measurements on a recurring basis | Quoted prices in active markets for identical assets (Level 1)
Fair Value Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	52,073	76,819
Derivative financial instruments	0	0
Deferred stock-based compensation	0	0
Fair Value measurements on a recurring basis | Significant other observable inputs (Level 2)
Fair Value Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	0	0
Derivative financial instruments	276	3,797
Deferred stock-based compensation	7,503	7,857
Fair Value measurements on a recurring basis | Significant unobservable inputs (Level 3)
Fair Value Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	0	0
Derivative financial instruments	0	0
Deferred stock-based compensation	0	0
Government Securities | Fair Value measurements on a recurring basis
Fair Value Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	6,339	7,384
Government Securities | Fair Value measurements on a recurring basis | Quoted prices in active markets for identical assets (Level 1)
Fair Value Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	0	0
Government Securities | Fair Value measurements on a recurring basis | Significant other observable inputs (Level 2)
Fair Value Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	6,339	7,384
Government Securities | Fair Value measurements on a recurring basis | Significant unobservable inputs (Level 3)
Fair Value Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	0	0
Corporate Bonds | Fair Value measurements on a recurring basis
Fair Value Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	6,323	4,620
Corporate Bonds | Fair Value measurements on a recurring basis | Quoted prices in active markets for identical assets (Level 1)
Fair Value Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	0	0
Corporate Bonds | Fair Value measurements on a recurring basis | Significant other observable inputs (Level 2)
Fair Value Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	6,323	4,620
Corporate Bonds | Fair Value measurements on a recurring basis | Significant unobservable inputs (Level 3)
Fair Value Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	$ 0	$ 0