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Condensed Consolidated Statements of Comprehensive Income (Loss) (Unaudited) - USD ($) $ in Thousands | 4 Months Ended
--- | ---
Apr. 20, 2019 | Apr. 21, 2018
Statement Of Income And Comprehensive Income [Abstract] |  |
Net income | $ 65,866 | $ 51,247
Pension and postretirement plans: |  |
Settlement loss |  | 3,490
Net gain for the period |  | 8,813
Amortization of prior service cost included in net income | 79 | 26
Amortization of actuarial loss included in net income | 1,569 | 1,076
Pension and postretirement plans, net of tax | 1,648 | 13,405
Derivative instruments: |  |
Net change in fair value of derivatives | (9,593) | 10,470
(Gain) loss reclassified to net income | (2,178) | 297
Derivative instruments, net of tax | (11,771) | 10,767
Other comprehensive income (loss), net of tax | (10,123) | 24,172
Comprehensive income | $ 55,743 | $ 75,419

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