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Employee Benefit Plans (Details 1) - USD ($)
$ in Thousands
 7 Months Ended 12 Months Ended
Dec. 31, 2015
Dec. 28, 2017
Dec. 29, 2016
May 28, 2015
Net periodic pension cost:        
Service cost $ 459 $ 765 $ 865 $ 697
Interest cost 765 1,356 1,406 1,243
Net amortization of prior service cost and actuarial loss 211 356 364 326
Curtailment gain 0 0 (251) 0
Total $ 1,435 $ 2,477 $ 2,384 $ 2,266