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Accumulated Other Comprehensive Income or Loss - Schedule Of Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 29, 2018	Dec. 30, 2017	Dec. 31, 2016
Accumulated Other Comprehensive Income Loss [Line Items]
Balance, value	$ 721,950	$ 825,407	$ 790,779
Other comprehensive loss before reclassifications	(2,026)	(2,448)	(643)
Income tax benefit	458	934	236
Other comprehensive loss, net of tax, before reclassifications	(1,568)	(1,514)	(407)
Amortization of amounts included in net periodic benefit cost	1,204	799	657
Income tax expense	(259)	(302)	(240)
Amounts reclassified out of AOCI, net of tax	945	497	417
Other comprehensive (loss) income, net of tax	(623)	(1,017)	10
Balance, value	715,947	721,950	825,407
Accumulated Other Comprehensive Income (Loss) [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Balance, value	(15,136)	(11,437)	(11,447)
Other comprehensive (loss) income, net of tax	(623)	(1,017)	10
Reclassification of stranded tax effects		(2,682)
Balance, value	$ (15,759)	$ (15,136)	$ (11,437)

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Tax cuts and jobs act of 2017, reclassification from AOCI to retained earnings, tax effect.

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Amount before tax and reclassification adjustments of other comprehensive income (loss).

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Amount of tax expense (benefit) allocated to other comprehensive income (loss) before reclassification adjustment from accumulated other comprehensive income (loss).

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