Quarterly report pursuant to Section 13 or 15(d)

Stock-Based Compensation (Narrative) (Details)

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Stock-Based Compensation (Narrative) (Details) - USD ($)
3 Months Ended 9 Months Ended
Jun. 30, 2018
Mar. 31, 2018
Dec. 30, 2017
Jul. 01, 2017
Dec. 31, 2016
Jun. 30, 2018
Jul. 01, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Allocated share-based compensation expense $ 800,000     $ 600,000   $ 2,000,000 $ 1,600,000
Restricted Stock Units and Performance Stock Units              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Vested in the period (shares) 2,000            
Performance Shares              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Vested in the period (shares)         53,248    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Payable in Cash, Percentage 50.00%            
Restricted Stock Units (RSUs)              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Vested in the period (shares)         8,438    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Payable in Cash, Percentage 50.00%            
2010 Stock Plan              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Aggregate number of shares that may be delivered (shares) 500,000         500,000  
Total compensation cost not yet recognized $ 4,300,000         $ 4,300,000  
Period for recognition           2 years 6 months  
Option Plan | Stock Options              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Allocated share-based compensation expense       $ 0   $ 0  
Vest Upon Filing of 10-K for the Year Ending September 28, 2019              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Vested in the period (shares)     55,750        
Vest Upon Filing of 10-K for the Year Ending September 28, 2019 | Restricted Stock Units and Performance Stock Units              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Vested in the period (shares)   2,000          
Vest Upon Filing of 10-K for the Year Ending September 28, 2019 | Performance Shares              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Instruments payable in common stock, (shares)     72,138        
Instruments payable in common stock (percentage)   0.5          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Payable in Cash, Percentage   50.00%          
Vest Upon Filing of 10-K for the Year Ending September 28, 2019 | Restricted Stock Units (RSUs)              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Vested in the period (shares)   2,000          
Instruments payable in common stock, (shares)     19,930        
Instruments payable in common stock (percentage)   0.5 0.5        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Payable in Cash, Percentage     50.00%        
Vest Upon Filing of 10-K for the Year Ending October 3, 2020 | Restricted Stock Units (RSUs)              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Vested in the period (shares)   90,000          
Upon Filing of Annual Report in 2017 | Performance Shares              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Vested in the period (shares)     92,068        
Upon Filing of Annual Report in 2017 | Restricted Stock Units (RSUs)              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Vested in the period (shares)     54,602