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Income Taxes - Components of Income, Provision For and Reconciliation of Tax (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2016
Oct. 01, 2016
Jul. 02, 2016
Apr. 02, 2016
Jan. 02, 2016
Oct. 03, 2015
Jul. 04, 2015
Apr. 04, 2015
Dec. 31, 2016
Jan. 02, 2016
Jan. 03, 2015
Income before provision for income taxes:                      
U.S.                 $ 16,905 $ 10,565 $ 20,899
Foreign                 4,984 1,250 2,416
Income before provision for income taxes $ 3,375 $ 5,060 $ 9,269 $ 4,185 $ (2,553) $ 4,346 $ 5,391 $ 4,631 21,889 11,815 23,315
Currently payable:                      
Federal                 (770) 5,104 8,585
Foreign                 664 546 876
State                 (637) 1,550 1,878
Currently payable                 (743) 7,200 11,339
Deferred:                      
Federal                 5,562 (799) (1,068)
Foreign                 124 (307) (505)
State                 2,713 (604) 142
Deferred                 8,399 (1,710) (1,431)
Provision (benefit) for income taxes                 $ 7,656 $ 5,490 $ 9,908
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)                 6.10% 5.40% 3.60%
Tax law changes (as a percent)                 (0.30%)    
Losses benefited (as a percent)                 (5.00%) (9.20%) (1.80%)
Losses not benefited (as a percent)                   5.00% 0.60%
Foreign rate differential (as a percent)                 (3.30%) (2.70%) 0.60%
Foreign tax credit (as a percent)                 (0.70%)    
Uncertain tax positions (as a percent)                 (0.20%) 8.70% 0.70%
Nondeductible/nontaxable items (as a percent)                 3.00% 6.80% 2.10%
Prior period adjustments (as a percent)                 (0.50%) (0.60%) 3.00%
Change in valuation allowance (as a percent)                 0.20% (1.70%) (2.20%)
GNU goodwill impairment (as a percent)                   13.40%  
GNU capital gain upon distribution (as a percent)                 1.10%    
GNU tax provision (benefit) (as a percent)                 0.20% (13.60%) 0.90%
Other (as a percent)                 (0.60%)    
Effective tax rate (as a percent)                 35.00% 46.50% 42.50%