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Fair Value Measurements (Details) - USD ($) $ in Thousands	Jul. 31, 2015	Jul. 31, 2014
Assets:
Available-for-sale securities	$ 40,287	$ 12,873
Foreign exchange forwards	38
Total	40,325
Liabilities:
Foreign exchange forwards	39
Fair Value, Measurements, Recurring [Member] | Level 1 [Member]
Assets:
Available-for-sale securities	$ 6,505
Foreign exchange forwards
Total	$ 6,505
Liabilities:
Foreign exchange forwards
Fair Value, Measurements, Recurring [Member] | Level 2 [Member]
Assets:
Available-for-sale securities	$ 33,782	$ 12,873
Foreign exchange forwards	38
Total	33,820
Liabilities:
Foreign exchange forwards	$ 39
Fair Value, Measurements, Recurring [Member] | Level 3 [Member]
Assets:
Available-for-sale securities
Foreign exchange forwards
Total
Liabilities:
Foreign exchange forwards

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Amount of investments in debt and equity securities, including, but not limited to, held-to-maturity, trading and available-for-sale expected to be converted to cash, sold or exchanged within one year or the normal operating cycle, if longer.

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



-Publisher FASB



-Name Accounting Standards Codification



-Topic 210



-SubTopic 10



-Section 45



-Paragraph 1



-Subparagraph (f)



-URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e6676-107765



Reference 2: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 320



-SubTopic 10



-Section 45



-Paragraph 2



-URI http://asc.fasb.org/extlink&oid=49167202&loc=d3e26626-111562



Reference 3: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 210



-SubTopic 10



-Section S99



-Paragraph 1



-Subparagraph (SX 210.5-02.2)



-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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