Benefit Plans - Amounts in Accumulated Other Comprehensive Loss Expected to be Recognized as Components of Net Periodic Pension Costs or Postretirement Benefits Costs in 2020 (Detail) $ in Thousands	Dec. 29, 2019 USD ($)
Defined Benefit Plan Disclosure [Line Items]
Actuarial loss	$ 5,108
Prior service cost	19
Total expected to be recognized	5,127
Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Actuarial loss	4,758
Prior service cost	19
Total expected to be recognized	4,777
Postretirement Medical [Member]
Defined Benefit Plan Disclosure [Line Items]
Actuarial loss	350
Total expected to be recognized	$ 350