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Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($)
$ in Thousands
 4 Months Ended
Apr. 23, 2016
Apr. 25, 2015
Statement Of Income And Comprehensive Income [Abstract]    
Net income $ 59,363 $ 61,389
Pension and postretirement plans:    
Amortization of prior service cost (credit) included in net income 33 (89)
Amortization of actuarial loss included in net income 1,020 832
Pension and postretirement plans, net of tax 1,053 743
Derivative instruments:    
Net change in fair value of derivatives [1] 2,588 (4,428)
Loss reclassified to net income 1,143 1,587
Derivative instruments, net of tax 3,731 (2,841)
Other comprehensive income (loss), net of tax 4,784 (2,098)
Comprehensive income $ 64,147 $ 59,291
[1] Amounts in parentheses indicate debits to determine net income.