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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, 2017
Jan. 01, 2017
Dec. 30, 2017
Sep. 30, 2017
Jul. 01, 2017
Apr. 01, 2017
Dec. 31, 2016
Oct. 01, 2016
Jul. 02, 2016
Apr. 02, 2016
Dec. 30, 2017
Dec. 31, 2016
Jan. 02, 2016
Income before provision for income taxes:                          
U.S.                     $ 12,248 $ 16,905 $ 10,565
Foreign                     2,916 4,984 1,250
Income before provision for income taxes     $ (898) $ 5,535 $ 5,919 $ 4,608 $ 3,375 $ 5,060 $ 9,269 $ 4,185 15,164 21,889 11,815
Currently payable:                          
Federal                     4,515 (770) 5,104
Foreign                     493 664 546
State                     804 (637) 1,550
Currently payable                     5,812 (743) 7,200
Deferred:                          
Federal                     1,809 5,562 (799)
Foreign                     (85) 124 (307)
State                     (73) 2,713 (604)
Deferred                     1,651 8,399 (1,710)
Provision (benefit) for income taxes                     $ 7,463 $ 7,656 $ 5,490
Reconciliation of tax rates with the federal statutory rate                          
Federal statutory rate (as a percent) 35.00%                   35.00% 35.00% 35.00%
State income taxes, net of federal income tax benefit (as a percent)                     3.90% 6.10% 5.40%
Tax law changes (as a percent)                     23.70% (0.30%)  
Share-based compensation (as a percent)                     (15.80%)    
Nondeductible/nontaxable items (as a percent)                     5.10% 3.00% 6.80%
Foreign rate differential (as a percent)                     (2.80%) (3.30%) (2.70%)
Losses benefited/Change in valuation allowance (as a percent)                     (0.30%) (4.90%) (6.00%)
Uncertain tax positions (as a percent)                     (0.10%) (0.20%) 8.70%
Other (as a percent)                     0.50% (0.40%) (0.70%)
Effective tax rate (as a percent)                     49.20% 35.00% 46.50%
ASU 2016-09                          
Deferred:                          
Provision (benefit) for income taxes   $ (50)                      
Reconciliation of tax rates with the federal statutory rate                          
Excess tax deductions                     $ 2,200