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 6 Months Ended
Mar. 31, 2018
Dec. 30, 2017
Apr. 01, 2017
Dec. 31, 2016
Mar. 31, 2018
Apr. 01, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Allocated share-based compensation expense $ 700,000   $ 400,000   $ 1,200,000 $ 1,000,000
Performance Shares            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Vested in the period (shares)       53,248    
Restricted Stock Units (RSUs)            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Vested in the period (shares)       8,438    
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 $ 5,200,000       $ 5,200,000  
Period for recognition         2 years 8 months 12 days  
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 | Performance Shares            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Vested in the period (shares) 2,000          
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