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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jul. 16, 2016
Jul. 18, 2015
Jul. 16, 2016
Jul. 18, 2015
Statement Of Income And Comprehensive Income [Abstract]        
Net earnings $ 17,484 $ 20,261 $ 27,335 $ 30,588
Other comprehensive income, before tax        
Pension and postretirement liability adjustment 1 205 3 477
Total other comprehensive income, before tax 1 205 3 477
Income tax expense related to items of other comprehensive income   (78) (1) (181)
Total other comprehensive income, after tax 1 127 2 296
Comprehensive income $ 17,485 $ 20,388 $ 27,337 $ 30,884