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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 |

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