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The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

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Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

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Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination.

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Goodwill and Intangible Assets - Additional Information (Detail) (USD $)	3 Months Ended		9 Months Ended
	Apr. 30, 2015	Apr. 30, 2014	Apr. 30, 2015	Apr. 30, 2014	Jul. 31, 2014
Goodwill and Intangible Assets Disclosure [Line Items]
Goodwill	$ 57,358,000us-gaap_Goodwill		$ 57,358,000us-gaap_Goodwill		$ 56,955,000us-gaap_Goodwill
Acquisition of goodwill			400,000us-gaap_GoodwillAcquiredDuringPeriod
Amortization expense related to acquired intangible assets	$ 2,200,000us-gaap_AmortizationOfIntangibleAssets	$ 1,900,000us-gaap_AmortizationOfIntangibleAssets	$ 6,600,000us-gaap_AmortizationOfIntangibleAssets	$ 5,700,000us-gaap_AmortizationOfIntangibleAssets
Minimum
Goodwill and Intangible Assets Disclosure [Line Items]
Intangible assets, estimated useful lives			1 year
Maximum
Goodwill and Intangible Assets Disclosure [Line Items]
Intangible assets, estimated useful lives			14 years