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Consolidated Statements of Comprehensive (Loss) Income (Unaudited) - USD ($)
$ in Thousands
3 Months Ended
Oct. 31, 2021
Oct. 31, 2020
Income Statement [Abstract]    
Net (loss) income $ (2,345) $ 8,415
Other comprehensive (loss) income:    
Change in unrealized gain on available-for-sale securities (111) (29)
Foreign currency translation adjustments 1,068 251
Other comprehensive income 957 222
Comprehensive (loss) income (1,388) 8,637
Comprehensive income attributable to noncontrolling interests (133) (127)
Comprehensive (loss) income attributable to IDT Corporation $ (1,521) $ 8,510