Retirement Benefit Plans, Defined Contribution Plan (Details) - USD ($)	3 Months Ended
	Apr. 01, 2017	Apr. 02, 2016
Defined Contribution Plan Disclosure [Line Items]
Total contributions made for the period	$ 559,413	$ 107,701
Regular Matching Contributions [Member]
Defined Contribution Plan Disclosure [Line Items]
Total contributions made for the period	116,475	56,231
Transitional Credit Contributions [Member]
Defined Contribution Plan Disclosure [Line Items]
Total contributions made for the period	135,370	0
Non-discretionary Contributions [Member]
Defined Contribution Plan Disclosure [Line Items]
Total contributions made for the period	$ 307,568	$ 51,470
Plan 401K Plan Original [Member]
Defined Contribution Plan Disclosure [Line Items]
Employer matching contribution percentage	50.00%
Plan 401 K Plan Amendment [Member]
Defined Contribution Plan Disclosure [Line Items]
Percentage of voluntary contributions allowed to participants, maximum	100.00%
Increase in employer matching contribution on first of total employee contributions, percentage	6.00%
Non-discretionary contribution percentage for employees who were not eligible to participate in the salaried plan	3.00%
U.S. Non Union Employees [Member] | Minimum [Member]
Defined Contribution Plan Disclosure [Line Items]
Non-discretionary contribution percentage for certain employees who were eligible to participate in the salaried plan	0.00%
U.S. Non Union Employees [Member] | Maximum [Member]
Defined Contribution Plan Disclosure [Line Items]
Non-discretionary contribution percentage for certain employees who were eligible to participate in the salaried plan	4.00%