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Employee Benefit Plans - Schedule of Defined Benefit Plans Disclosure (Details) - USD ($)
$ in Thousands
 12 Months Ended
Sep. 29, 2018
Sep. 30, 2017
Sep. 24, 2016
Pension Benefits [Member]      
Reconciliation of benefit obligations:      
Benefit obligation at beginning of year $ 122,647 $ 150,363  
Interest cost 3,778 4,164 $ 5,041
Actuarial (gain) loss (4,535) (4,018)  
Lump sum benefits paid (3,373) (20,799) (5,816)
Ordinary benefits paid (6,816) (7,063)  
Plan amendment 0 0  
Benefit obligation at end of year 111,701 122,647 150,363
Reconciliation of fair value of plan assets:      
Fair value of plan assets at beginning of year 85,649 101,077  
Actual (loss) return on plan assets (2,192) 911  
Employer contributions 4,764 11,523 715
Lump sum benefits paid (3,373) (20,799)  
Ordinary benefits paid (6,816) (7,063)  
Fair value of plan assets at end of year 78,032 85,649 101,077
Funded status:      
Funded status at end of year (33,669) (36,998)  
Amounts recognized in consolidated balance sheets consist of:      
Net amount recognized at end of year (33,669) (36,998)  
Less: current portion 0 0  
Noncurrent benefit liability (33,669) (36,998)  
Amounts not yet recognized in net periodic benefit cost and included in accumulated other comprehensive income (loss):      
Actuarial net (loss) gain (33,180) (37,311)  
Prior service credits 0 0  
Net amount recognized in accumulated other comprehensive (loss) income (33,180) (37,311)  
Retiree Health and Life Benefits [Member]      
Reconciliation of benefit obligations:      
Benefit obligation at beginning of year 9,853 13,778  
Interest cost 277 385 520
Actuarial (gain) loss (1,164) 123  
Lump sum benefits paid 0 0  
Ordinary benefits paid (1,071) (1,187)  
Plan amendment 0 (3,246)  
Benefit obligation at end of year 7,895 9,853 13,778
Reconciliation of fair value of plan assets:      
Fair value of plan assets at beginning of year 0 0  
Actual (loss) return on plan assets 0 0  
Employer contributions 1,071 1,187  
Lump sum benefits paid 0 0  
Ordinary benefits paid (1,071) (1,187)  
Fair value of plan assets at end of year 0 0 $ 0
Funded status:      
Funded status at end of year (7,895) (9,853)  
Amounts recognized in consolidated balance sheets consist of:      
Net amount recognized at end of year (7,895) (9,853)  
Less: current portion 1,128 1,243  
Noncurrent benefit liability (6,767) (8,610)  
Amounts not yet recognized in net periodic benefit cost and included in accumulated other comprehensive income (loss):      
Actuarial net (loss) gain 5,762 5,253  
Prior service credits 2,748 3,246  
Net amount recognized in accumulated other comprehensive (loss) income $ 8,510 $ 8,499