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Income Taxes - Additional Information (Detail) - USD ($)
12 Months Ended
Jan. 03, 2017
Dec. 29, 2015
Dec. 30, 2014
Dec. 31, 2013
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]        
Income tax credit carryforwards $ 6,559,000 $ 13,188,000    
Valuation allowances against net operating loss and tax credit carryforwards 300,000 600,000    
Unrecognized tax benefits 1,245,000 $ 2,998,000 $ 2,173,000 $ 219,000
Unrecognized tax benefits that would impact effective tax rate, if reversed 900,000      
Anticipated change in liability for unrecognized tax benefits within next twelve-month period 0      
Federal        
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]        
Income tax credit carryforwards $ 6,500,000      
Tax credits expiration year 2034      
Federal | Earliest Tax Year        
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]        
Income tax examination, years open 2013      
State or Local Taxing Jurisdiction        
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]        
Income tax credit carryforwards $ 1,400,000      
Tax credits expiration year 2023      
State or Local Taxing Jurisdiction | Earliest Tax Year        
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]        
Income tax examination, years open 2012