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Commitments and Contingencies Operating Lease (Details) - USD ($)
 12 Months Ended
Sep. 24, 2017
Sep. 25, 2016
Sep. 27, 2015
Long-term Purchase Commitment [Line Items]      
Operating Leases, Future Minimum Payments Due, Next Twelve Months $ 3,000,000    
Operating Leases, Future Minimum Payments, Due in Two Years 1,581,000    
Operating Leases, Future Minimum Payments, Due in Three Years 1,026,000    
Operating Leases, Future Minimum Payments, Due in Four Years 784,000    
Operating Leases, Future Minimum Payments, Due in Five Years 439,000    
Operating Leases, Future Minimum Payments, Due Thereafter 3,000,000    
Operating Leases, Rent Expense $ 3,866,000 $ 3,792,000 $ 3,415,000