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Common Stock Warrants - Assumptions Used to Estimate Fair Value of Common Stock Warrants (Detail) - Customer Common Stock Warrants [Member]
12 Months Ended
Jul. 31, 2014
$ / shares
Estimated Fair Value Of Common Stock Warrants [Line Items]  
Dividend yield 0.00%
Minimum [Member]  
Estimated Fair Value Of Common Stock Warrants [Line Items]  
Expected volatility 34.90%
Risk-free interest rate 0.07%
Expected term (in years) 3 months 11 days
Fair value of common stock $ 4.11
Maximum [Member]  
Estimated Fair Value Of Common Stock Warrants [Line Items]  
Expected volatility 37.00%
Risk-free interest rate 0.11%
Expected term (in years) 4 months 28 days
Fair value of common stock $ 7.38