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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) - USD ($) $ in Thousands	4 Months Ended
	Apr. 21, 2018	Apr. 22, 2017
Statement Of Income And Comprehensive Income [Abstract]
Net earnings	$ 12,343	$ 15,025
Other comprehensive income, before tax
Pension and postretirement liability adjustment	111	41
Total other comprehensive income, before tax	111	41
Income tax expense related to items of other comprehensive income	(27)	(16)
Total other comprehensive income, after tax	84	25
Comprehensive income	$ 12,427	$ 15,050

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