Changes to AOCI, Net of Income Tax, By Component (Detail) - USD ($) $ in Thousands		12 Months Ended
		Dec. 28, 2019	Dec. 29, 2018	Dec. 30, 2017
Accumulated Other Comprehensive Income Loss [Line Items]
Balances		$ 1,258,267	$ 1,250,677	$ 1,210,080
Other comprehensive gain (loss) before reclassifications		457	(16,853)	(9,426)
Reclassified to earnings from AOCI	[1]	2,694	11,047	8,150
Balances		1,263,430	1,258,267	1,250,677
Cash Flow Hedge Items
Accumulated Other Comprehensive Income Loss [Line Items]
Balances		(4,135)	(6,483)
Other comprehensive gain (loss) before reclassifications		8,457	2,978
Reclassified to earnings from AOCI		(2,664)	1,079
Reclassified to retained earnings from AOCI			(1,709)
Balances		1,658	(4,135)	(6,483)
Accumulated Defined Benefit Plans Adjustment
Accumulated Other Comprehensive Income Loss [Line Items]
Balances		(105,036)	(78,076)
Other comprehensive gain (loss) before reclassifications		(8,000)	(19,831)	(2,637)
Reclassified to earnings from AOCI	[1]	5,358	9,968	6,783
Reclassified to retained earnings from AOCI			(17,097)
Balances		(107,678)	(105,036)	(78,076)
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income Loss [Line Items]
Balances		(109,171)	(84,559)	(83,283)
Other comprehensive gain (loss) before reclassifications		457	(16,853)
Reclassified to earnings from AOCI		2,694	11,047
Reclassified to retained earnings from AOCI			(18,806)
Balances		$ (106,020)	$ (109,171)	$ (84,559)

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