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Benefit Plans - Reconciliation of Amounts in Accumulated Other Comprehensive Loss That Have Not Yet Been Recognized as Components of Net Periodic Benefit Cost (Detail)
$ in Thousands
12 Months Ended
Dec. 30, 2018
USD ($)
Defined Benefit Plan Disclosure [Line Items]  
Actuarial gain (loss) $ 18,588
Net periodic benefit cost, beginning balance (155,493)
Reclassification Adjustments, Net periodic benefit cost 3,897
Net periodic benefit cost, ending balance (133,008)
Pension Plans [Member]  
Defined Benefit Plan Disclosure [Line Items]  
Actuarial gain (loss), beginning balance (127,461)
Actuarial gain (loss) 4,036
Reclassification Adjustments, Actuarial gain (loss) 3,830
Actuarial gain (loss), ending balance (119,595)
Prior service (cost) credit, beginning balance (73)
Reclassification Adjustments, Prior service (cost) credit 25
Prior service (cost) credit, ending balance (48)
Postretirement Medical [Member]  
Defined Benefit Plan Disclosure [Line Items]  
Actuarial gain (loss), beginning balance (39,356)
Actuarial gain (loss) 14,552
Reclassification Adjustments, Actuarial gain (loss) 1,889
Actuarial gain (loss), ending balance (22,915)
Prior service (cost) credit, beginning balance 3,140
Reclassification Adjustments, Prior service (cost) credit (1,847)
Prior service (cost) credit, ending balance 1,293
Postretirement Medical [Member] | October 2017 Divestitures [Member]  
Defined Benefit Plan Disclosure [Line Items]  
Recognized loss due to the divestitures, beginning balance 8,257
Recognized loss due to the divestitures, ending balance $ 8,257