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SUPPLEMENTAL BALANCE SHEET INFORMATION Other long-term liabilities (Details) - USD ($)
Mar. 31, 2021
Dec. 30, 2020
Sep. 23, 2020
Other Liabilities Disclosure [Abstract]      
Contract with Customer, Liability, Noncurrent $ 11,965,000 $ 12,151,000  
Finance Lease, Liability, Noncurrent 4,056,000 3,586,000  
Other Sundry Liabilities, Noncurrent 6,276,000 8,723,000  
Other Liabilities, Noncurrent $ 22,297,000 $ 24,460,000  
Deferred lease incentive liabilities     $ 3,359
Deferred social security taxes     $ 2,607