Employee Benefit Plans (Details 1) - USD ($) $ in Thousands	7 Months Ended	12 Months Ended
	Dec. 31, 2015	Dec. 29, 2016	May 28, 2015	May 29, 2014
Net periodic pension cost:
Service cost	$ 459	$ 865	$ 697	$ 702
Interest cost	765	1,406	1,243	1,173
Net amortization of prior service cost and actuarial loss	211	364	326	268
Curtailment gain	0	(251)	0	0
Total	$ 1,435	$ 2,384	$ 2,266	$ 2,143