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Retirement Plans - Components of Net Periodic Benefit Cost (Details) - USD ($)
$ in Thousands
 3 Months Ended 4 Months Ended 9 Months Ended
Jul. 04, 2021
Jul. 05, 2020
Apr. 12, 2020
Jan. 19, 2020
Jul. 04, 2021
Jul. 05, 2020
Defined Benefit Plan Disclosure [Line Items]            
Pension settlements   $ 100 $ 300 $ 38,600    
Pension Plan            
Defined Benefit Plan Disclosure [Line Items]            
Interest cost $ 3,398 3,581     $ 11,328 $ 12,326
Expected return on plan assets (4,463) (3,779)     (14,877) (15,141)
Pension settlements 0 103     0 39,030
Actuarial loss (gain) [1] 1,212 1,367     4,041 4,058
Amortization of unrecognized prior service cost [1] 5 20     15 65
Net periodic benefit cost 152 1,292     507 40,338
Postretirement Healthcare Plans            
Defined Benefit Plan Disclosure [Line Items]            
Interest cost 130 186     433 621
Actuarial loss (gain) [1] (78) 4     (262) 13
Net periodic benefit cost $ 52 $ 190     $ 171 $ 634
[1] Amounts were reclassified from accumulated other comprehensive loss into net earnings as a component of “Other pension and post-retirement expenses, net