Annual report pursuant to Section 13 and 15(d)

Employee Retirement Plan and Deferred Compensation Plan - Additional Information (Details)

v3.8.0.1
Employee Retirement Plan and Deferred Compensation Plan - Additional Information (Details) - USD ($)
1 Months Ended 12 Months Ended
Jan. 31, 2010
Dec. 30, 2017
Dec. 31, 2016
Jan. 02, 2016
Retirement Benefits [Abstract]        
Minimum service period required to cover under plan   1 month    
Employer's match per dollar of participants salary   $ 0.50    
Employer's match percentage of participants salary   6.00%    
Contributions vest in annual installments   3 years    
Discretionary contributions   $ 286,000 $ 289,000 $ 280,000
Highly Compensated Employees        
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]        
Participant deferral of base salary, percentage (up to) 90.00%      
Participant deferral of annual earned bonus, percentage (up to) 100.00%      
Deferred compensation plan vested 100.00%      
Employer contribution percentage of eligible participants eligible contribution 50.00%      
Employer matching contribution, percentage of participants eligible contributions 2.00%      
Increase (decrease) in deferred compensation, employee contribution   135,000 156,000  
Increase (decrease) in deferred compensation, employer contribution   26,000 69,000  
Increase (decrease) in deferred compensation, earnings   110,000 41,000  
Increase (decrease) in deferred compensation, distributions   281,000 23,000  
Gain (loss) on change in cash surrender value   5,000 2,000  
Other non-current assets | Highly Compensated Employees        
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]        
Deferred compensation plan assets   579,000 676,000  
Other non-current liabilities | Highly Compensated Employees        
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]        
Deferred compensation plan associated liabilities   $ 675,000 $ 688,000