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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, 2017
USD ($)
shares
Sep. 30, 2016
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     365,000        
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     0 75,000      
Remaining contractual life on the options outstanding     4 years 3 months 19 days        
Number of options, forfeited or cancelled     0        
Shares outstanding     440,000 483,750 446,625 474,750  
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     Oct. 01, 2021        
Estimated fair value of options at time of grant | $   $ 138,000          
Compensation expense remaining to be expensed | $     $ 78,000        
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 | $     $ 110,000        
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