Postretirement Benefits Schedule of Net Funded Status and APBO (Details) - USD ($)	12 Months Ended
	Jan. 03, 2016	Dec. 28, 2014	Dec. 29, 2013
Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract]
Benefit obligation at beginning of year	$ 3,121,000	$ 2,370,000
Service cost	127,000	85,000	$ 89,000
Interest cost	114,000	92,000	91,000
Plan participants' contributions	101,000	89,000
Actuarial loss (gain)	(214,000)	808,000
Benefits paid	(220,000)	(342,000)
Medicare part D prescription drug subsidy	31,000	19,000
Benefit obligation at end of year	3,060,000	3,121,000	2,370,000
Employer contributions	88,000	234,000
Fair value of plan assets at beginning of year	0	0
Fair value of plan assets at end of year	0	0	$ 0
Funded status	$ (3,060,000)	$ (3,121,000)
Discount rate used to determine benefit obligations	4.25%	3.83%
Discount rate used to determine net periodic benefit cost	3.83%	4.48%