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Settlement of Claims with IDT and Sale of Straight Path IP Group (Tables)
3 Months Ended
Oct. 31, 2017
Settlement of Claims with IDT and Sale of Straight Path IP Group [Abstract]  
Schedule of discontinued operations of straight path IP group
  Three Months Ended 
  October 31, 
  2017  2016 
  (in thousands) 
       
Revenues $-  $- 
         
Costs and expenses:        
Selling, general and administrative  1,294   875 
         
Total costs and expenses  1,294   875 
         
Loss from operations  (1,294)  (875)
         
Other income (expense):        
Interest expense including amortization of debt discounts  (195)  - 
Interest income  -   2 
         
Total other income (expense)  (195)  2 
         
Loss provision for income taxes  (1,489)  (873)
Provision for income taxes  -   (1)
         
Net loss  (1,489)  (874)
         
Loss attributable to noncontrolling interests  229   124 
         
Net loss from discontinued operations attributable to Straight Path Communications Inc. $(1,260) $(750)