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FAIR VALUE MEASUREMENTS Fair Value measurements (Hierarchy) (Details) - USD ($)
Sep. 29, 2018
Dec. 30, 2017
Sep. 30, 2017
Fair Value, Inputs, Level 1 [Member]      
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]      
Investments $ 17,600,000 $ 16,700,000 $ 15,700,000
Foreign exchange forward contracts 0 0 0
Fair Value, Inputs, Level 2 [Member]      
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]      
Investments 0 0 0
Foreign exchange forward contracts 0 0 200,000
Fair Value, Inputs, Level 3 [Member]      
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]      
Investments 0 0 0
Foreign exchange forward contracts $ 0 $ 0 $ 0