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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Jan. 02, 2016
Jan. 03, 2015
Statement Of Income And Comprehensive Income [Abstract]      
Net earnings $ 56,828 $ 62,710 $ 58,596
Other comprehensive income (loss), before tax      
Pension and postretirement liability adjustment 14 429 (4,785)
Total other comprehensive income (loss), before tax 14 429 (4,785)
Income tax (expense) benefit related to items of other comprehensive income (4) (221) 1,924
Total other comprehensive income (loss), after tax 10 208 (2,861)
Comprehensive income $ 56,838 $ 62,918 $ 55,735