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Components of Net Periodic Benefit Cost (Detail) - USD ($)
$ in Thousands
 4 Months Ended
Apr. 18, 2020
Apr. 20, 2019
Defined Benefit Plan Disclosure [Line Items]    
Settlement and curtailment loss $ 116,207  
Pension plans    
Defined Benefit Plan Disclosure [Line Items]    
Service cost 265 $ 216
Interest cost 1,423 3,671
Expected return on plan assets (2,689) (5,276)
Settlement and curtailment loss 116,207  
Amortization of prior service cost (credit) 75 119
Amortization of net (gain) loss 1,367 2,184
Total net periodic pension cost (income) 116,648 914
Postretirement Benefit Plan    
Defined Benefit Plan Disclosure [Line Items]    
Service cost 87 87
Interest cost 60 91
Amortization of prior service cost (credit) (1) (13)
Amortization of net (gain) loss (92) (85)
Total net periodic pension cost (income) $ 54 $ 80