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Stock-Based Compensation - Additional Information (Detail)
12 Months Ended
Sep. 26, 2016
USD ($)
shares
Jan. 19, 2016
USD ($)
shares
Sep. 30, 2016
USD ($)
shares
Sep. 30, 2015
shares
Sep. 30, 2014
shares
Mar. 17, 2009
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Common stock options issued to employees     408,750      
Stock split ratio     1.5      
2009 Plan [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Common stock options issued to employees     75,000      
Remaining contractual life on the options outstanding     5 years 8 months 12 days      
Number of options, forfeited or cancelled     0      
Shares outstanding     483,750 446,625 474,750  
1997 Plan [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Shares available for granting     0      
Shares outstanding     0 41,250 41,250  
January 19, 2016 Class B Stock Options [Member] | 2009 Plan [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Common stock options issued to employees   30,000 45,000      
Options vesting rate   25.00%        
Options vesting period     Options vest at 25% per year starting on January 19, 2017 and each year thereafter through January 19, 2020      
Options exercisable     Jan. 19, 2026      
Estimated fair value of options at time of grant | $   $ 138,000        
Compensation expense remaining to be expensed | $     $ 112,000      
September 26, 2016 Class B Stock Options [Member] | 2009 Plan [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Common stock options issued to employees 30,000          
Options vesting rate 25.00%          
Options vesting period     Options vest at 25% per year starting on September 26, 2017 and each year thereafter through September 26, 2020      
Options exercisable     Sep. 26, 2026      
Estimated fair value of options at time of grant | $ $ 147,000          
Compensation expense remaining to be expensed | $     $ 147,000      
Common Stock [Member] | 2009 Plan [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Maximum number of shares granting of awards           800,000
Shares available for granting     482,000      
Common Stock [Member] | 1997 Plan [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Incentive and nonqualified stock options, Number of shares authorized to purchase     1,200,000      
Percentage of common stock to be purchased of authorized common stock of any subsidiary     15.00%      
Options expiration period after date of grant     10 years      
Class B Stock [Member] | 2009 Plan [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Maximum number of shares granting of awards           160,000
Shares available for granting     100,000      
Class B Stock [Member] | 1997 Plan [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Incentive and nonqualified stock options, Number of shares authorized to purchase     1,200,000