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Zedge Spin-Off (Tables)
12 Months Ended
Jul. 31, 2017
Zedge Spin-Off [Member]  
Schedule of consolidated statements of income
Year ended July 31
(in thousands)
 2017  2016  2015 
INCOME (LOSS) BEFORE INCOME TAXES $  $2,518  $(4)
             
INCOME BEFORE INCOME TAXES ATTRIBUTABLE TO IDT CORPORATION $  $2,221  $23