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Components of Net Periodic Benefit (Income) Cost (Detail) - USD ($)
 12 Months Ended
Jan. 02, 2021
Dec. 28, 2019
Dec. 29, 2018
Defined Benefit Plan Disclosure [Line Items]      
Settlement loss   $ 0  
Current year actuarial (gain) loss $ (25,515,000) 11,277,000 $ 25,492,000
Total recognized in net periodic (benefit) cost and OCI (26,486,000) 6,763,000 20,111,000
Pension plans      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 854,000 703,000 937,000
Interest cost 2,108,000 11,930,000 12,513,000
Expected return on plan assets (3,933,000) (17,147,000) (18,831,000)
Settlement loss 104,473,000   7,781,000
Curtailment loss 4,284,000    
Amortization of prior service cost (credit) 115,000 387,000 387,000
Amortization of net (gain) loss 1,747,000 7,098,000 5,811,000
Net periodic pension cost (income) 109,648,000 2,971,000 8,598,000
Settlement loss (104,473,000)   (7,781,000)
Curtailment loss (4,284,000)    
Amortization of prior service (cost) credit (115,000) (387,000) (387,000)
Amortization of actuarial gain (loss) (1,747,000) (7,098,000) (5,811,000)
Total recognized in OCI (136,134,000) 3,792,000 11,513,000
Postretirement Benefit Plans      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 285,000 283,000 288,000
Interest cost 194,000 297,000 234,000
Amortization of prior service cost (credit) (4,000) (41,000) (212,000)
Amortization of net (gain) loss (300,000) (276,000) (431,000)
Net periodic pension cost (income) 175,000 263,000 (121,000)
Current year actuarial (gain) loss 643,000 (575,000) 1,036,000
Amortization of prior service (cost) credit 4,000 41,000 212,000
Amortization of actuarial gain (loss) 300,000 276,000 431,000
Total recognized in OCI 947,000 (258,000) 1,679,000
Total recognized in net periodic (benefit) cost and OCI $ 1,122,000 $ 5,000 $ 1,558,000