Employee Benefit Plans (Details Textual) - USD ($)	7 Months Ended	12 Months Ended
	Dec. 31, 2015	Dec. 28, 2017	Dec. 29, 2016	May 28, 2015
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay		1.00%
Defined Contribution Plan, Employer Matching Contribution, Percent of Match		25.00%
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent		6.00%
Defined Contribution Plan, Cost Recognized	$ 2,362,000	$ 4,415,000	$ 3,960,000	$ 3,581,000
Accumulated Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net of Tax		7,414,000	5,069,000
Defined Benefit Plan, Accumulated Other Comprehensive Income Net Prior Service Cost (Credit), after Tax		579,000	642,000
Defined Benefit Plan, Accumulated Benefit Obligation		31,769,000	28,151,000
Defined Benefit Plan, Actuarial Gain (Loss)		4,244,000	82,000
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net Gain (Loss), Net of Tax		420,000	329,000
Other Comprehensive (Income) Loss, Amortization Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net Prior Service Cost (Credit), before Tax		64,000	261,000
Defined Benefit Plan, Accumulated Other Comprehensive Income Net Gains (Losses), after Tax		$ 12,874,000	9,049,000
DescriptionOfDefinedContributionPensionAndOtherPostretirementPlans		The 401(k) plan provides a matching contribution equal to 100% of the first 3% of compensation and 50% of the next 2% of compensation deposited by an employee into the 401(k) plan
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Curtailments	$ 0	$ 0	251,000	$ 0
Defined Benefit Plan, Plan Amendments		82,000
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Unamortized Gain (Loss) Arising During Period, Net of Tax		7,763,000	5,457,000
Defined Benefit Plan, Accumulated Other Comprehensive Income Net Prior Service Cost (Credit), after Tax		349,000	$ 388,000
Forecast [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Accumulated Other Comprehensive Income Net Prior Service Cost (Credit), after Tax		64,000
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, Net of Tax, Total		620,000
Defined Benefit Plan, Accumulated Other Comprehensive Income Net Gains (Losses), after Tax		$ 684,000