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BANK CREDIT ARRANGEMENTS (Details) - USD ($)
Dec. 28, 2019
Dec. 29, 2018
Bank Credit Arrangements    
Outstanding amount $ 21,774,000 $ 10,678,000
Short-term borrowings    
Bank Credit Arrangements    
Total line of credit facility for short-term borrowings 132,849,000  
Outstanding amount $ 21,774,000 $ 10,678,000
Weighted average interest rate on short-term borrowings 2.54%  
Unused and available borrowings $ 111,075,000