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SUPPLEMENTAL BALANCE SHEET INFORMATION Other long-term liabilities (Details) - USD ($)
$ in Thousands
Sep. 23, 2020
Dec. 25, 2019
Other Liabilities Disclosure [Abstract]    
Contract with Customer, Liability, Noncurrent $ 12,144 $ 11,310
Finance Lease, Liability, Noncurrent 3,492 3,643
Other Sundry Liabilities, Noncurrent 6,192 375
Other Liabilities, Noncurrent 21,828 $ 15,328
Deferred lease incentive liabilities 3,388  
Deferred social security taxes $ 2,461