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Employee Benefit Plans - Components of Net Periodic Benefit Costs (Details) - USD ($)
$ in Thousands
 12 Months Ended
Sep. 29, 2018
Sep. 30, 2017
Sep. 24, 2016
Components of net periodic benefit costs included in operating expenses [Abstract]      
Settlement charge $ 0 $ 6,100 $ 2,000
Pension Benefits [Member]      
Components of net periodic benefit costs included in operating expenses [Abstract]      
Interest cost 3,778 4,164 5,041
Expected return on plan assets (1,894) (2,150) (3,418)
Amortization of prior service credit 0 0 0
Settlement charge 0 6,100 2,000
Recognized net actuarial loss (gain) 3,683 5,201 5,218
Net periodic benefit costs 5,567 13,315 8,841
Retiree Health and Life Benefits [Member]      
Components of net periodic benefit costs included in operating expenses [Abstract]      
Interest cost 277 385 520
Expected return on plan assets 0 0 0
Amortization of prior service credit (498) 0 (399)
Settlement charge 0 0 0
Recognized net actuarial loss (gain) (654) (389) (299)
Net periodic benefit costs $ (875) $ (4) $ (178)