Postretirement Benefits Schedule of Net Funded Status and APBO (Details) - USD ($)	12 Months Ended
	Jan. 01, 2017	Jan. 03, 2016	Dec. 28, 2014
Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract]
Benefit obligation at beginning of year	$ 3,060,000	$ 3,121,000
Service cost	150,000	127,000	$ 85,000
Interest cost	165,000	114,000	92,000
Plan participants' contributions	98,000	101,000
Actuarial loss (gain)	1,251,000	(214,000)
Benefits paid	(164,000)	(220,000)
Medicare part D prescription drug subsidy	6,000	31,000
Benefit obligation at end of year	4,566,000	3,060,000	3,121,000
Employer contributions	60,000	88,000
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	$ (4,566,000)	$ (3,060,000)
Discount rate used to determine benefit obligations	4.11%	4.25%
Discount rate used to determine net periodic benefit cost	4.25%	3.83%