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Other Operating Expense, Net (Details 1) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Apr. 30, 2020
Apr. 30, 2019
Apr. 30, 2020
Apr. 30, 2019
Error Corrections and Prior Period Adjustments Restatement [Line Items]        
Other operating expense, net $ (234) $ (2,420) $ (3,402) $ (5,805)
Provision/Benefit for income taxes (1,319) 1,471 (3,020) (704)
Net income (loss) 385 2,457 (133) (552)
Net income (loss) attributable to IDT Corporation $ 518 $ 2,170 $ (63) $ (1,440)
Earnings (loss) per share attributable to IDT Corporation common stockholders:        
Basic $ 0.02 $ 0.08 $ (0.00) $ (0.06)
Diluted $ 0.02 $ 0.08 $ 0.00 $ (0.06)
Error Correction [Member]        
Error Corrections and Prior Period Adjustments Restatement [Line Items]        
Other operating expense, net   $ (2,300)   $ (5,400)
Provision/Benefit for income taxes   600   1,350
Net income (loss)   (1,700)   (4,050)
Net income (loss) attributable to IDT Corporation   $ (1,700)   $ (4,050)
Earnings (loss) per share attributable to IDT Corporation common stockholders:        
Basic   $ (0.07)   $ (0.16)
Diluted   $ (0.07)   $ (0.16)
Previously Reported [Member]        
Error Corrections and Prior Period Adjustments Restatement [Line Items]        
Other operating expense, net   $ (120)   $ (405)
Provision/Benefit for income taxes   871   (2,054)
Net income (loss)   4,157   3,498
Net income (loss) attributable to IDT Corporation   $ 3,870   $ 2,610
Earnings (loss) per share attributable to IDT Corporation common stockholders:        
Basic   $ 0.15   $ 0.1
Diluted   $ 0.15   $ 0.1
As Adjusted [Member]        
Error Corrections and Prior Period Adjustments Restatement [Line Items]        
Other operating expense, net   $ (2,420)   $ (5,805)
Provision/Benefit for income taxes   1,471   (704)
Net income (loss)   2,457   (552)
Net income (loss) attributable to IDT Corporation   $ 2,170   $ (1,440)
Earnings (loss) per share attributable to IDT Corporation common stockholders:        
Basic   $ 0.08   $ (0.06)
Diluted   $ 0.08   $ (0.06)