Changes to AOCI, Net of Income Tax, By Component (Detail) - USD ($) $ in Thousands		12 Months Ended
		Dec. 29, 2018	Dec. 30, 2017	Dec. 31, 2016
Accumulated Other Comprehensive Income Loss [Line Items]
Balances		$ 1,250,677	$ 1,210,080	$ 1,243,082
Other comprehensive gain (loss) before reclassifications		(16,853)	(9,426)	1,717
Reclassified to earnings from AOCI	[1]	11,047	8,150	11,800
Reclassified to retained earnings from AOCI		18,800
Balances		1,258,267	1,250,677	1,210,080
Cash Flow Hedge Items
Accumulated Other Comprehensive Income Loss [Line Items]
Balances		(6,483)	(1,061)
Other comprehensive gain (loss) before reclassifications		2,978	(6,789)
Reclassified to earnings from AOCI		1,079	1,367
Reclassified to retained earnings from AOCI		(1,709)
Balances		(4,135)	(6,483)	(1,061)
Accumulated Defined Benefit Plans Adjustment
Accumulated Other Comprehensive Income Loss [Line Items]
Balances		(78,076)	(82,222)
Other comprehensive gain (loss) before reclassifications		(19,831)	(2,637)	(4,013)
Reclassified to earnings from AOCI	[1]	9,968	6,783	8,401
Reclassified to retained earnings from AOCI		(17,097)
Balances		(105,036)	(78,076)	(82,222)
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income Loss [Line Items]
Balances		(84,559)	(83,283)	(96,800)
Other comprehensive gain (loss) before reclassifications		(16,853)	(9,426)
Reclassified to earnings from AOCI		11,047	8,150
Reclassified to retained earnings from AOCI		(18,806)
Balances		$ (109,171)	$ (84,559)	$ (83,283)

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