Changes to AOCI, Net of Income Tax, By Component (Detail) - USD ($) $ in Thousands		4 Months Ended
		Apr. 18, 2020	Apr. 20, 2019
Accumulated Other Comprehensive Income Loss [Line Items]
Balances		$ 1,263,430	$ 1,258,267
Reclassified to earnings from AOCI	[1]	88,284	(530)
Balances		1,320,611	1,267,926
Cash Flow Hedge Items
Accumulated Other Comprehensive Income Loss [Line Items]
Balances		1,658	(4,135)
Other comprehensive income (loss) before reclassifications		(3,849)	(9,593)
Reclassified to earnings from AOCI		411	(2,178)
Balances		(1,780)	(15,906)
Defined Benefit Pension Plan Items
Accumulated Other Comprehensive Income Loss [Line Items]
Balances		(107,678)	(105,036)
Other comprehensive income (loss) before reclassifications		15,693
Reclassified to earnings from AOCI	[1]	87,873	1,648
Balances		(4,112)	(103,388)
Accumulated Other Comprehensive Loss
Accumulated Other Comprehensive Income Loss [Line Items]
Balances		(106,020)	(109,171)
Other comprehensive income (loss) before reclassifications		11,844	(9,593)
Reclassified to earnings from AOCI		88,284	(530)
Balances		$ (5,892)	$ (119,294)

[1] Amounts in parentheses indicate debits to determine net income.