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Associate Retirement Plans - Components of Net Periodic Pension and Postretirement Benefit Cost (Income) (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Jan. 02, 2021
Dec. 28, 2019
Dec. 29, 2018
Pension Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Interest cost   $ 1,134 $ 2,283
Expected return on plan assets   (714) (3,631)
Gain on reconciliation with annuity provider $ (1,193)    
Recognized actuarial net loss   691 417
Net periodic benefit (income) expense (1,193) 1,111 (931)
Settlement expense   18,244 785
Total net periodic benefit (income) cost (1,193) $ 19,355 $ (146)
Weighted average assumptions at measurement date:      
Discount rate   3.48% 3.45%
Expected return on plan assets   2.80% 4.84%
Retiree Medical Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 182 $ 171 $ 195
Interest cost 303 375 339
Amortization of prior service cost   (92) (158)
Recognized actuarial net loss 104   88
Net periodic benefit (income) expense 589 454 464
Total net periodic benefit (income) cost $ 589 $ 454 $ 464
Weighted average assumptions at measurement date:      
Discount rate 3.26% 4.41% 3.72%