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Other Retirement Plans (Details) - USD ($)
12 Months Ended
Sep. 30, 2018
Sep. 24, 2017
Sep. 25, 2016
Other Retirement Plans [Line Items]      
Multiemployer Plans, Withdrawal Obligation   $ 2,600,000  
Payment for Pension Benefits $ 4,990,000 0 $ 4,604,000
Cost Related to Other Retirement Plans 4,430,000 4,396,000 4,616,000
GCIU- Employer Retirement Fund [Member]      
Other Retirement Plans [Line Items]      
Payment for Pension Benefits 107,000 123,000 138,000
CWA/ITU Negotiated Pension Plan [Member]      
Other Retirement Plans [Line Items]      
Payment for Pension Benefits 96,000 101,000 108,000
District No. 9 Pension Trust [Member]      
Other Retirement Plans [Line Items]      
Payment for Pension Benefits $ 29,000 $ 31,000 $ 31,000