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Marketable Securities (Details 2) - USD ($) $ in Thousands	Jul. 31, 2015	Jul. 31, 2014
Schedule Of Available For Sale Securities [Line Items]
Unrealized Losses	$ 587
Fair Value	13,284
Certificates Of Deposit [Member]
Schedule Of Available For Sale Securities [Line Items]
Unrealized Losses	2
Fair Value	2,194
International agency notes [Member]
Schedule Of Available For Sale Securities [Line Items]
Unrealized Losses	1
Fair Value	1,119
Mutual funds [Member]
Schedule Of Available For Sale Securities [Line Items]
Unrealized Losses	18
Fair Value	4,982
Straight Path Communications Inc. common stock [Member]
Schedule Of Available For Sale Securities [Line Items]
Unrealized Losses	563
Fair Value	1,523
Equity Securities [Member]
Schedule Of Available For Sale Securities [Line Items]
Unrealized Losses		$ 9
Fair Value		$ 22
Municipal Bonds [Member]
Schedule Of Available For Sale Securities [Line Items]
Unrealized Losses	3
Fair Value	$ 3,466

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Available for sale securities gross unrealized loss accumulated in accumulated other comprehensive income.

+ References

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- Definition

This item represents the aggregate fair value of investments in debt and equity securities in an unrealized loss position which are categorized neither as held-to-maturity nor trading securities.

+ References

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



-Publisher FASB



-Name Accounting Standards Codification



-Topic 320



-SubTopic 10



-Section 50



-Paragraph 6



-Subparagraph (a)(1)



-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563

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