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Employee Benefit Plans (Details)
12 Months Ended
Oct. 02, 2016
USD ($)
Year
Sep. 27, 2015
USD ($)
Sep. 28, 2014
USD ($)
Sep. 30, 2012
Oct. 02, 2011
Postemployment Benefits [Abstract]          
Maximum annual contribution per employee, percent 50.00%        
Minimum age employee may contribute additional percentage of wages | Year 50        
Maximum additional contribution allowed after age 50, percent 75.00%        
Employer contributions $ 4,400,000        
Fair value of plan assets 4,100,000        
Benefit obligations 4,200,000 $ 6,900,000      
Unrealized actuarial loss on pension benefits $ (3,900,000) $ (300,000) $ (700,000)    
Discount rate assumption 1.60% 2.80%   1.00% 2.10%
Estimated future employer contributions in the next twelve months $ 0