Amount recovered from patent infringers paid to law firms terms.

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Description of the license disclosures.

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Date which license is set to establish a new expiration date must be form in CCYY-MM-DD format.

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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Excludes cash and cash equivalents within disposal group and discontinued operation.

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- Definition

Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury.

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Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.

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The amount of capitalized costs incurred in the period to renew or extend the term of a recognized finite-lived (amortizing and amortizable) intangible asset.

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Percentage of subsidiary's or equity method investee's stock owned by parent immediately after all stock transactions.

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Description of Business and Summary of Significant Accounting Policies (Details Textual) (USD $) Share data in Thousands, unless otherwise specified						1 Months Ended	12 Months Ended
	Jul. 31, 2013	Jul. 31, 2014 Common Stock [Member] Common Class A [Member]	Jul. 31, 2013 Common Stock [Member] Common Class A [Member]	Jul. 31, 2014 Common Stock [Member] Common Class B [Member]	Jul. 31, 2013 Common Stock [Member] Common Class B [Member]	Oct. 31, 2010 Straight Path Spectrum [Member]	Jul. 31, 2014 Straight Path Spectrum [Member]	Jul. 31, 2014 Straight Path IP Group [Member]	Jul. 31, 2013 Idt [Member] Common Class A [Member]	Jul. 31, 2013 Idt [Member] Common Class B [Member]
Description of Business and Summary of Significant Accounting Policies (Textual)
Ownership in Straight Path Spectrum							100.00%	84.50%
Renewal of 39 GHz FCC licenses						$ 210,000
License patent expiration date						Oct. 18, 2018
Description of License						The Company included the license renewal costs in other assets, which are being charged to expense on a straight-line basis over the ten-year term of the licenses.
Common stock shares distributed		787	787	11,013	10,693
Common stock shares outstanding		787	787	11,013	10,693				1,600	21,400
Cash at the time of spin off	$ 15,000,000
Settlement of litigation, description								Intellectual property rights a percentage of the amounts recovered ranging from 0% to 40% depending on several factors.