Changes to AOCI, Net of Income Tax, By Component (Detail) - USD ($) $ in Thousands		4 Months Ended
		Apr. 21, 2018	Apr. 22, 2017
Accumulated Other Comprehensive Income Loss [Line Items]
Balances		$ 1,250,677
Reclassified to earnings from AOCI	[1]	4,889	$ 1,617
Reclassified to retained earnings from AOCI		18,800
Balances		1,291,531
Gains/Losses on Cash Flow Hedges
Accumulated Other Comprehensive Income Loss [Line Items]
Balances		(6,483)	(1,061)
Other comprehensive income before reclassifications		10,470	(3,518)
Reclassified to earnings from AOCI		297	474
Reclassified to retained earnings from AOCI		(1,709)
Balances		2,575	(4,105)
Accumulated Defined Benefit Plans Adjustment
Accumulated Other Comprehensive Income Loss [Line Items]
Balances		(78,076)	(82,222)
Other comprehensive income before reclassifications		8,813
Reclassified to earnings from AOCI	[1]	4,592	1,143
Reclassified to retained earnings from AOCI		(17,097)
Balances		(81,768)	(81,079)
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income Loss [Line Items]
Balances		(84,559)	(83,283)
Other comprehensive income before reclassifications		19,283	(3,518)
Reclassified to earnings from AOCI		4,889	1,617
Reclassified to retained earnings from AOCI		(18,806)
Balances		$ (79,193)	$ (85,184)

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