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Cash Held in Escrow Cash Held in Escrow (Details) - USD ($)
$ in Thousands
Dec. 29, 2018
Dec. 30, 2017
Cash in escrow    
Cash in escrow $ 16,561 $ 11,218
Workers compensation insurance    
Cash in escrow    
Cash in escrow 10,194 8,074
Acquisition-related    
Cash in escrow    
Cash in escrow 6,009 0
Property taxes and insurance    
Cash in escrow    
Cash in escrow 0 2,904
Benefits-related    
Cash in escrow    
Cash in escrow $ 358 $ 240