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Stock-based compensation and equity transactions - Additional Information (Detail) (USD $)
 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended
Apr. 30, 2013
Jan. 31, 2013
Jul. 31, 2013
Jul. 31, 2012
Jul. 31, 2013
Incentive stock options
Jul. 31, 2013
Common Stock
Jul. 31, 2013
Stock Option
Jul. 31, 2012
Stock Option
Jul. 31, 2013
Stock Option
Jul. 31, 2013
Cost of Sales
Jul. 31, 2012
Cost of Sales
Jul. 31, 2013
Selling, General and Administrative Expenses
Jul. 31, 2012
Selling, General and Administrative Expenses
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Weighted average fair value of stock options under Black-Scholes pricing model     $ 1.12 $ 1.23                  
Issuance of common stock for exercise of stock option           877,728     877,728        
Proceeds from exercise of stock options     $ 2,225,000 $ 141,000                  
Weighted average remaining life of options outstanding     3 years 1 month 28 days                    
Weighted average remaining contractual life of options exercisable     2 years 7 months 6 days                    
Weighted average life of options vested and expected to vest     3 years 1 month 20 days                    
Aggregate intrinsic value of options outstanding     4,600,000                    
Aggregate intrinsic value of options exercisable     3,500,000                    
Aggregate intrinsic value of options vested and expected to vest     3,500,000                    
Non-vested stock-based arrangements yet to be recognized     268,000                    
Stock based arrangements yet to be recognized, weighted average period expected to be recognized     3 years 22 days                    
Stock-based compensation expense     161,000 164,000     54,000 43,000   38,000 42,000 123,000 122,000
Non-employee director annual grant     25,000                    
Options granted for each non-employee director 4,367 8,405                      
Value of stock option issued $ 7,292 $ 12,500                      
Fair value of stock option $ 1.67 $ 1.49                      
Incentive stock options         138,280