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Debt - Additional Information (Detail) - USD ($)
3 Months Ended 9 Months Ended
Apr. 14, 2016
Jun. 30, 2014
Mar. 18, 2014
Apr. 30, 2016
Apr. 30, 2015
Apr. 30, 2016
Apr. 30, 2015
Jul. 31, 2015
Debt Instrument [Line Items]                
Debt instrument issued       $ 99,500,000   $ 99,500,000   $ 100,000,000
Face amount of purchased Notes $ 500,000              
Purchase of the Company's Convertible Notes 359,000         359,000    
Gain on purchase of Notes 100,000              
Reduction in equity component $ 20,000              
Notes payable, Fair Value       69,712,000   69,712,000   88,188,000
Debt instrument, carrying amount       81,228,000   $ 81,228,000   77,864,000
Convertible debt, remaining discount amortization period           34 months    
PNC Bank Credit Facility                
Debt Instrument [Line Items]                
Line of credit facility, term   5 years            
Line of credit facility, maximum credit commitment   $ 50,000,000            
Credit facility expiry date           Jun. 30, 2019    
Line of credit facility, unutilized commitment fee percentage   0.25%            
Outstanding indebtedness under the Credit Facility       $ 0   $ 0   $ 0
Domestic Subsidiaries                
Debt Instrument [Line Items]                
Percentage of equity interests pledged           100.00%    
Foreign Subsidiaries                
Debt Instrument [Line Items]                
Percentage of equity interests pledged           65.00%    
Letter of Credit Sublimit | PNC Bank Credit Facility                
Debt Instrument [Line Items]                
Line of credit facility, maximum credit commitment   $ 5,000,000            
Uncommitted Accordion Feature | PNC Bank Credit Facility                
Debt Instrument [Line Items]                
Line of credit facility, maximum credit commitment   $ 20,000,000            
Scenario 1 | London Interbank Offered Rate (LIBOR) | PNC Bank Credit Facility                
Debt Instrument [Line Items]                
Debt instrument, percentage points added to the reference rate   2.25%            
Scenario 2 | London Interbank Offered Rate (LIBOR) | PNC Bank Credit Facility                
Debt Instrument [Line Items]                
Debt instrument, percentage points added to the reference rate   1.00%            
Scenario 2 | Federal Funds Open Rate | PNC Bank Credit Facility                
Debt Instrument [Line Items]                
Debt instrument, percentage points added to the reference rate   0.50%            
5.25% Convertible Senior Notes due 2019                
Debt Instrument [Line Items]                
Debt instrument issued     $ 100,000,000          
Debt instrument, stated interest rate     5.25% 0.50%   0.50%    
Debt instrument, convertible, conversion ratio           166.2593    
Initial Conversion price       $ 6.01   $ 6.01    
Debt instrument, redemption price percentage     100.00%          
Debt instrument, convertible, earliest date           Mar. 06, 2017    
Debt instrument, convertible, threshold percentage of stock price trigger           130.00%    
Debt instrument, convertible, threshold trading days           20 days    
Debt instrument, convertible, threshold consecutive trading days           30 days    
Additional interest paid       $ 200,000   $ 200,000    
Debt instrument conversion option           28,100,000    
Debt instrument issuance costs           3,400,000    
Deferred debt instrument issuance costs       2,500,000   2,500,000    
Debt instrument, interest expense       $ 2,836,000 $ 2,549,000 $ 8,174,000 $ 7,532,000  
Debt instrument, interest rate, effective percentage       14.11%   14.11%