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Fair Value Measurements (Details) - USD ($)
$ in Thousands

Jan. 31, 2017

Jul. 31, 2016

Assets:

Available-for-sale securities

$ 53,273

$ 52,949

Fair Value, Measurements, Recurring [Member] | Level 1 [Member]

Assets:

Available-for-sale securities

^[1]

10,627

12,445

Fair Value, Measurements, Recurring [Member] | Level 2 [Member]

Assets:

Available-for-sale securities

^[2]

42,646

40,504

Fair Value, Measurements, Recurring [Member] | Level 3 [Member]

Assets:

Available-for-sale securities

^[3]

[1]	quoted prices in active markets for identical assets or liabilities
[2]	observable inputs other than quoted prices in active markets for identical assets and liabilities
[3]	no observable pricing inputs in the market

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- References

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- Definition

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.

+ References

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=66010992&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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