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Stock-Based Compensation (Tables)
 9 Months Ended
Jun. 27, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Weighted Average Assumptions Used to Estimate Fair Value of Stock Option Grants
In addition to the exercise and grant date prices of the stock option awards, certain weighted average assumptions that were used to estimate the fair value of stock option grants are listed in the following table:

 
Fiscal 2017
Incentive and
Non-Statutory Stock Options
  
Fiscal 2016
Incentive and
Non-Statutory Stock Options
Expected term (years)
6.5 to 7.5
  
6.5 to 7.5
Expected volatility
75.41% to 80.70%
  
79.75% to 89.08%
Risk-free interest rate
1.49% to 2.40%
  
1.45% to 2.07%
Expected dividends
0
  
0
Summary of Stock Option Activity under Share Based Compensation Plan
The following table summarizes stock option activity for the three quarters ended June 27, 2017 under all plans:

   
Shares
    
Weighted
Average
Exercise Price
    
Weighted Avg.
Remaining
Contractual Life (Yrs.)
  
Outstanding-at beginning of year
  
586,083
    
$
4.99
        
Options granted
  
151,834
    
$
3.13
        
Options exercised
  
0
                
Forfeited
  
(3,132
)
  
$
7.66
        
Expired
  
(15,217
)
  
$
19.14
        
Outstanding June 27, 2017
  
719,568
    
$
4.29
    
7.1
  
Exercisable June 27, 2017
  
437,507
    
$
4.10
    
5.9
Schedule of Non-vested Restricted Stock Activity
A summary of the status of non-vested restricted stock as of June 27, 2017 is presented below.

 
Shares
    
Grant Date Fair
Value Per Share
  
Non-vested shares at beg of year
180,916 
    
$3.23 to $8.60
  
Granted
103,440 
    
$3.15 to $3.20
  
Vested
(20,815)
    
$3.20 to $8.23
  
Non-vested shares at June 27, 2017
263,541 
    
$3.15 to $8.60