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Defined Benefit Pension Plans - Amounts Recognized in Accumulated Other Comprehensive Loss (Detail) - USD ($)
$ in Thousands
Dec. 30, 2017
Dec. 31, 2016
Disclosure Defined Benefit Pension Plans Amounts Recognized In Accumulated Other Comprehensive Loss [Abstract]    
Prior service cost $ (163) $ 216
Actuarial loss 618,579 603,394
Accumulated other comprehensive loss $ 618,416 $ 603,610