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Fair Value Measurements of Financial Instruments (Details) - Fair Value measurements on a recurring basis - USD ($) $ in Thousands | Dec. 31, 2016 | Jan. 02, 2016
--- | --- | ---
Fair Value Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative financial instruments | $ 2,309 | $ (1,252)
Government securities |  |
Fair Value Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale securities, fair value disclosure | 6,268 | 9,663
Corporate bonds |  |
Fair Value Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale securities, fair value disclosure | 6,017 | 2,405
Quoted prices in active markets for identical assets (Level 1) |  |
Fair Value Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative financial instruments | 0 | 0
Quoted prices in active markets for identical assets (Level 1) | Government securities |  |
Fair Value Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale securities, fair value disclosure | 0 | 0
Quoted prices in active markets for identical assets (Level 1) | Corporate bonds |  |
Fair Value Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale securities, fair value disclosure | 0 | 0
Significant other observable inputs (Level 2) |  |
Fair Value Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative financial instruments | 2,309 | (1,252)
Significant other observable inputs (Level 2) | Government securities |  |
Fair Value Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale securities, fair value disclosure | 6,268 | 9,663
Significant other observable inputs (Level 2) | Corporate bonds |  |
Fair Value Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale securities, fair value disclosure | 6,017 | 2,405
Significant unobservable inputs (Level 3) |  |
Fair Value Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative financial instruments | 0 | 0
Significant unobservable inputs (Level 3) | Government securities |  |
Fair Value Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale securities, fair value disclosure | 0 | 0
Significant unobservable inputs (Level 3) | Corporate bonds |  |
Fair Value Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale securities, fair value disclosure | $ 0 | $ 0

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