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Funded Status and Amounts Recognized in Consolidated Balance Sheets (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Jan. 02, 2021
Dec. 28, 2019
Dec. 29, 2018
Change in benefit obligation:      
Actuarial loss (gain) $ (3,718) [1] $ (45,979)  
Change in plan assets:      
Current liability (874) (29,380)  
Noncurrent liability (10,049) (14,328)  
Pension plans      
Change in benefit obligation:      
Benefit obligation at beginning of year 396,906 367,778  
Service cost 854 703 $ 937
Interest cost 2,108 11,930 12,513
Actuarial loss (gain) (13,657) 45,979  
Benefits paid (7,762) (29,484)  
Settlements (340,799)    
Benefit obligation at end of year 37,650 396,906 367,778
Change in plan assets:      
Fair value of plan assets at beginning of year 360,675 335,540  
Actual return on plan assets 15,790 51,848 2,400
Employer contribution 7,871 2,771 40,971
Benefits paid (7,762) (29,484)  
Transfer payments (1,025)    
Settlements (340,799)    
Fair value of plan assets at end of year 34,750 360,675 335,540
Fair value of plan assets at end of year 34,750 360,675 335,540
Benefit obligation at end of year 37,650 396,906 367,778
Unfunded status and amount recognized at end of year (2,900) (36,231)  
Current liability (259) (28,711)  
Noncurrent liability (2,641) (7,520)  
Amount recognized at end of year (2,900) (36,231)  
Net actuarial (gain) loss before taxes 10,347 142,082  
Prior service cost before taxes 255 4,653  
Amounts recognized in accumulated other comprehensive income (loss) 10,602 146,735  
Accumulated benefit obligation at end of year 36,104 395,676  
Postretirement Benefit Plans      
Change in benefit obligation:      
Benefit obligation at beginning of year 7,477 8,194  
Service cost 285 283 288
Interest cost 194 297 234
Participant contributions 573 662 800
Actuarial loss (gain) 642 (575)  
Benefits paid (1,148) (1,384)  
Benefit obligation at end of year 8,023 7,477 8,194
Change in plan assets:      
Employer contribution 575 722  
Benefits paid (1,148) (1,384)  
Participant contributions 573 662 800
Benefit obligation at end of year 8,023 7,477 $ 8,194
Unfunded status and amount recognized at end of year (8,023) (7,477)  
Current liability (615) (669)  
Noncurrent liability (7,408) (6,808)  
Amount recognized at end of year (8,023) (7,477)  
Net actuarial (gain) loss before taxes (1,735) (2,677)  
Prior service cost before taxes (5) (9)  
Amounts recognized in accumulated other comprehensive income (loss) $ (1,740) $ (2,686)  
[1] Includes only losses from plans remaining at December 31, 2020