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Stock-Based Compensation Expenses (Details) (USD $)
 3 Months Ended 6 Months Ended
Jan. 31, 2014
Jan. 31, 2013
Jan. 31, 2014
Jan. 31, 2013
Jul. 31, 2013
Stock-based Compensation Expenses          
Stock-based compensation expense before income tax benefit $ 1,069,000 $ 806,000 $ 2,016,000 $ 1,551,000  
Estimated income tax benefit (403,000) (346,000) (749,000) (610,000)  
Net stock-based compensation expense 666,000 460,000 1,267,000 941,000  
Total remaining unrecognized compensation cost related to the unvested stock-based awards 9,310,000   9,310,000    
Estimated forfeitures related to unvested stock-based awards 580,000   580,000    
Weighted average number of years net compensation cost is expected to be recognized over     3 years 1 month 6 days    
Stock-based compensation capitalized and included in ending inventory 52,000   52,000   72,000
Cost of sales
          
Stock-based Compensation Expenses          
Stock-based compensation expense before income tax benefit 84,000 74,000 137,000 119,000  
Selling, general and administrative expenses
          
Stock-based Compensation Expenses          
Stock-based compensation expense before income tax benefit 832,000 614,000 1,603,000 1,215,000  
Research and development expenses
          
Stock-based Compensation Expenses          
Stock-based compensation expense before income tax benefit 153,000 118,000 276,000 217,000  
Stock Options
          
Stock-based Compensation Expenses          
Stock-based compensation expense before income tax benefit 719,000 638,000 1,367,000 1,211,000  
Performance Shares
          
Stock-based Compensation Expenses          
Stock-based compensation expense before income tax benefit 230,000 86,000 407,000 172,000  
Employee Stock Purchase Plan - ESPP
          
Stock-based Compensation Expenses          
Stock-based compensation expense before income tax benefit 43,000 48,000 88,000 101,000  
Discount offered to employees participating in the ESPP as a percentage of market price 15.00% 15.00% 15.00% 15.00%  
RSUs and restricted stock
          
Stock-based Compensation Expenses          
Stock-based compensation expense before income tax benefit 68,000 28,000 136,000 60,000  
Share units
          
Stock-based Compensation Expenses          
Stock-based compensation expense before income tax benefit 6,000 6,000 12,000 12,000  
Total equity-classified stock-based awards
          
Stock-based Compensation Expenses          
Stock-based compensation expense before income tax benefit 1,066,000 806,000 2,010,000 1,556,000  
SARs
          
Stock-based Compensation Expenses          
Stock-based compensation expense before income tax benefit 3,000 0 6,000 (5,000)  
Accrued expense related to the cash settlement of liability-classified stock appreciation rights $ 7,000   $ 7,000   $ 1,000