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Stock options - Additional Information (Detail) - USD ($)
12 Months Ended
Sep. 04, 2015
Sep. 05, 2014
Oct. 31, 2015
Mar. 09, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Weighted average remaining life of options outstanding     5 years 2 months 19 days  
Weighted average remaining contractual life of options exercisable     3 years 7 months 2 days  
Weighted average life of options vested and expected to vest     5 years 2 months 16 days  
Aggregate intrinsic value of options outstanding     $ 1,500,000  
Aggregate intrinsic value of options exercisable     1,400,000  
Aggregate intrinsic value of options vested and expected to vest     1,500,000  
Non-vested stock-based arrangements yet to be recognized     $ 667,000  
Stock based arrangements yet to be recognized, weighted average period expected to be recognized     5 years 9 months 4 days  
Non-employee director annual grant     $ 30,000  
Options granted for each non-employee director     14,916  
Value of stock option issued     $ 15,000  
Fair value of stock option     $ 1.01  
2000 Stock Option Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized     1,320,000  
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized       1,000,000
2010 Stock Incentive Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant     866,843  
Incentive and Non-Qualified Stock Option Plans        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Additional Shares Of Common Stock Issued 500,000 500,000    
Additional Shares Of Common Stock Issuance Date     Sep. 05, 2014