Income Taxes - Components of Income, Provision For and Reconciliation of Tax (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Jan. 02, 2016	Oct. 03, 2015	Jul. 04, 2015	Apr. 04, 2015	Jan. 03, 2015	Sep. 27, 2014	Jun. 28, 2014	Mar. 29, 2014	Jan. 02, 2016	Jan. 03, 2015	Dec. 28, 2013
Income before (provision) benefit for income taxes:
U.S.									$ 10,565	$ 20,899	$ 13,659
Foreign									1,250	2,416	4,259
Total	$ (2,553)	$ 4,346	$ 5,391	$ 4,631	$ 6,022	$ 5,575	$ 6,334	$ 5,384	11,815	23,315	17,918
Currently payable:
Federal									5,104	8,585	1,241
Foreign									546	876	1,264
State									1,550	1,878	254
Currently payable									7,200	11,339	2,759
Deferred:
Federal									(799)	(1,068)	3,592
Foreign									(307)	(505)	(238)
State									(604)	142	570
Deferred									$ (1,710)	$ (1,431)	$ 3,924
Reconciliation of tax rates with federal statutory rate
Federal statutory rate (as a percent)									35.00%	35.00%	35.00%
State income taxes, net of federal income tax benefit (as a percent)									9.20%	3.60%	4.40%
State law changes									(3.80%)
Foreign losses benefited (as a percent)									(9.20%)	(1.80%)	(2.80%)
Losses not benefited (as a percent)									5.00%	0.60%	0.30%
Foreign rate differential (as a percent)									(2.70%)	0.60%	(0.40%)
Foreign tax credit (as a percent)											(0.10%)
Uncertain tax positions (as a percent)									8.70%	0.70%	(2.10%)
NeuCo goodwill impairment (as a percent)									13.40%
NeuCo tax provision (benefit) (as a percent)									(13.60%)	0.90%	1.50%
Permanently disallowed expenses (as a percent)									6.80%	2.10%	1.60%
Prior period adjustments (as a percent)									(0.60%)	3.00%
Release of valuation allowance (as a percent)									(1.70%)	(2.20%)
Other (as a percent)											(0.10%)
Effective tax rate (as a percent)									46.50%	42.50%	37.30%