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Goodwill and Intangible Assets - Summary of Amortization Expense of Intangible Assets (Detail) (USD $)
In Thousands, unless otherwise specified |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
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Jan. 31, 2015
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Jan. 31, 2014
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Jan. 31, 2015
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Jan. 31, 2014
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| Finite Lived Intangible Assets Amortization Expense [Line Items] | ||||
| Amortization expense of intangible assets | $ 2,106 | $ 2,384 | $ 4,266 | $ 4,748 |
| Cost of product revenue [Member] | ||||
| Finite Lived Intangible Assets Amortization Expense [Line Items] | ||||
| Amortization expense of intangible assets | 1,941 | 2,025 | 3,936 | 4,030 |
| Sales and marketing [Member] | ||||
| Finite Lived Intangible Assets Amortization Expense [Line Items] | ||||
| Amortization expense of intangible assets | 144 | 353 | 288 | 706 |
| Research & development [Member] | ||||
| Finite Lived Intangible Assets Amortization Expense [Line Items] | ||||
| Amortization expense of intangible assets | 6 | 6 | 13 | 12 |
| General and administrative [Member] | ||||
| Finite Lived Intangible Assets Amortization Expense [Line Items] | ||||
| Amortization expense of intangible assets | $ 15 | $ 0 | $ 29 | $ 0 |