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Pension and Other Post-retirement Benefits - Actuarial Gains and Losses (Details) - USD ($)
$ in Thousands
Oct. 25, 2020
Oct. 27, 2019
Pension Benefits    
Amounts recognized in accumulated other comprehensive loss    
Unrecognized Prior Service Credit $ (2,128) $ 40
Unrecognized Actuarial Losses (402,289) (429,599)
Post-retirement Benefits    
Amounts recognized in accumulated other comprehensive loss    
Unrecognized Prior Service Credit 514 3,166
Unrecognized Actuarial Losses $ (36,144) $ (34,266)