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Summary of Significant Accounting Policies - Recent Accounting Standards (Details) - USD ($)
$ in Thousands
Jan. 02, 2016
Jan. 03, 2015
Dec. 28, 2013
Dec. 29, 2012
Changes in Financial position due to early adoption of ASU 2015-17        
Long-term deferred income tax assets   $ 19,272    
Long-term deferred income tax liabilities   (1,608)    
Net deferred tax assets $ 18,856 17,664    
Total current assets 140,794 144,529    
Total assets 313,717 313,472    
Total current liabilities 86,458 88,273    
Total shareholders' equity $ 211,068 214,704 $ 224,637 $ 212,234
Adjustments for early adoption of ASU 2015-17 | As Filed        
Changes in Financial position due to early adoption of ASU 2015-17        
Current deferred income tax assets   20,638    
Long-term deferred income tax assets   174    
Current deferred income tax liabilities   (121)    
Long-term deferred income tax liabilities   (3,027)    
Net deferred tax assets   17,664    
Total current assets   165,167    
Total assets   315,012    
Total current liabilities   88,394    
Total shareholders' equity   214,704    
Adjustments for early adoption of ASU 2015-17 | Reclass        
Changes in Financial position due to early adoption of ASU 2015-17        
Current deferred income tax assets   (20,638)    
Long-term deferred income tax assets   19,098    
Current deferred income tax liabilities   121    
Long-term deferred income tax liabilities   1,419    
Total current assets   (20,638)    
Total assets   (1,540)    
Total current liabilities   $ (121)