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Description of Business and Summary of Significant Accounting Policies (Details Textual) (USD $)
Share data in Thousands, unless otherwise specified
 12 Months Ended 1 Months Ended 12 Months Ended
Jul. 31, 2013
Jul. 31, 2012
Jul. 31, 2013
Patents [Member]
Jul. 31, 2013
Common Class A [Member]
Jul. 31, 2012
Common Class A [Member]
Jul. 31, 2013
Common Class B [Member]
Jul. 31, 2012
Common Class B [Member]
Oct. 31, 2010
Straight Path Spectrum [Member]
Jul. 31, 2013
Straight Path Spectrum [Member]
Jul. 31, 2013
Straight Path IP [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               $ 200,000        
License patent expiration date                 Oct. 18, 2020 Sep. 25, 2015    
Description of License                 The Company included the license renewal costs in prepaid expenses, which is being charged to expense on a straight-line basis over the ten year term of the licenses.      
Net speak portfolio    
(1)  
NetSpeak Portfolio:
 
United States Patents Nos. 6,108,704; 6,131,121; 6,701,365; 6,513,066; 6,185,184; 6,829,645; 6,687,738; 6,009,469; 6,226,678; 7,149,208 and 6,178,453, and the foreign counterparts to U.S. Patent No. 6,108,704, listed below:
 
727702
Australia
764522
Australia
764583
Australia
764521
Australia
2231127
Canada
96197195.9
China
852868
Finland
852868
France
852868
Germany
1017192
Hong Kong
10-414512
Korea
212126
Mexico
51774
Singapore
852868
Sweden
852868
Italy
NI-096566
Taiwan
 
                  
Droplet portfolio    
(2)  
Droplet Portfolio:
 
United States Patents Nos. 6,825,780; 6,847,317; 7,844,122; 7,525,463; 8,279,098;
7,436,329; and 7,679,649 and a number of U.S. and foreign patent applications.
                  
Common stock shares distributed       787    10,693             
Common stock shares outstanding       787    10,693          1,600 21,400
Net loss (3,213,000) 4,789,000                    
IDT transferred cash to the company so that it will be available at the time of spin-off 15,000,000                      
License renewal costs   $ 21,000