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CONSOLIDATED STATEMENTS OF COMPREHENSIVE (LOSS) INCOME - USD ($) $ in Thousands	12 Months Ended
	Dec. 30, 2017	Dec. 31, 2016	Jan. 02, 2016
Statement Of Income And Comprehensive Income [Abstract]
Net (loss) earnings	$ (52,845)	$ 56,828	$ 62,710
Other comprehensive (loss) income, before tax
Pension and postretirement liability adjustment	(1,649)	14	429
Total other comprehensive (loss) income, before tax	(1,649)	14	429
Income tax benefit (expense) related to items of other comprehensive income	632	(4)	(221)
Total other comprehensive (loss) income, after tax	(1,017)	10	208
Comprehensive (loss) income	$ (53,862)	$ 56,838	$ 62,918

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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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