Benefit Plans - Amounts in Accumulated Other Comprehensive Loss Expected to be Recognized as Components of Net Periodic Pension Costs or Postretirement Benefits Costs in 2016 (Detail) $ in Thousands	Dec. 30, 2018 USD ($)
Defined Benefit Plan Disclosure [Line Items]
Actuarial loss	$ 4,386
Prior service cost (credit)	(1,270)
Total expected to be recognized	3,116
Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Actuarial loss	3,603
Prior service cost (credit)	23
Total expected to be recognized	3,626
Postretirement Medical [Member]
Defined Benefit Plan Disclosure [Line Items]
Actuarial loss	783
Prior service cost (credit)	(1,293)
Total expected to be recognized	$ (510)