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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

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