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Restructuring Costs (Schedule of Activity in Restructuring Expense Accruals) (Details) - USD ($)
 3 Months Ended 12 Months Ended
Dec. 27, 2019
Dec. 27, 2019
Dec. 29, 2017
Restructuring Cost And Reserve [Line Items]      
Additions $ 3,300,000 $ 3,334,000 $ 1,300,000
Expenditures   (1,750,000)  
Accrual ending balance 1,584,000 1,584,000 $ 0
Severance and Other Employee Costs [Member]      
Restructuring Cost And Reserve [Line Items]      
Additions   2,912,000  
Expenditures   (1,665,000)  
Accrual ending balance 1,247,000 1,247,000  
Exit Closure and Consolidation of Facilities [Member]      
Restructuring Cost And Reserve [Line Items]      
Additions   422,000  
Expenditures   (85,000)  
Accrual ending balance $ 337,000 $ 337,000