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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	12 Months Ended
	Dec. 28, 2019	Dec. 29, 2018	Dec. 30, 2017
Statement Of Income And Comprehensive Income [Abstract]
Net earnings (loss)	$ 5,742	$ 33,572	$ (52,845)
Other comprehensive income (loss), before tax
Pension and postretirement liability adjustment	18,699	(822)	(1,649)
Income tax (expense) benefit related to items of other comprehensive income	(4,540)	199	632
Total other comprehensive income (loss), after tax	14,159	(623)	(1,017)
Comprehensive income (loss)	$ 19,901	$ 32,949	$ (53,862)

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Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.

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