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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jul. 15, 2017
Jul. 16, 2016
Jul. 15, 2017
Jul. 16, 2016
Statement Of Income And Comprehensive Income [Abstract]        
Net earnings $ 21,029 $ 17,484 $ 36,054 $ 27,335
Other comprehensive income, before tax        
Pension and postretirement liability adjustment 31 1 72 3
Total other comprehensive income, before tax 31 1 72 3
Income tax expense related to items of other comprehensive income (11)   (27) (1)
Total other comprehensive income, after tax 20 1 45 2
Comprehensive income $ 21,049 $ 17,485 $ 36,099 $ 27,337