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Revenue (Details) - USD ($)
 6 Months Ended 12 Months Ended
Jan. 31, 2021
Jul. 31, 2020
Revenue (Details) [Line Items]    
Unsatisfied performance obligations, description The Company records deferred revenues related to the unsatisfied performance obligations with respect to subscription revenue. As of January 31, 2021, the Company’s deferred revenue balance related to paid subscriptions was approximately $1,515,000, representing approximately 711,000 active subscribers including those under the account hold implemented by Google Play on November 1, 2020. Account hold is a subscription state that begins when a user's form of payment fails and the three-day grace period has ended without payment resolution. The account hold period lasts for up to 30 days. As of July 31, 2020, the Company’s deferred revenue balance related to paid subscriptions was approximately $1,169,000, representing approximately 504,000 active subscribers.  
Deferred balance $ 816,000  
Credits, description The Company also records deferred revenues when users purchase or earn Zedge Credits. Unused Zedge Credits represent the value of the Company’s unsatisfied performance obligation to its users. Revenue is recognized when Zedge App users use Zedge Credits to acquire Zedge Premium content or upon expiration of the Zedge Credits upon 180 days of account inactivity.  
Zedge Premium [Member]    
Revenue (Details) [Line Items]    
Deferred balance $ 1,712,000  
Deferred balance 197,000 $ 169,000
Deferred revenues increased $ 374,000 $ 1,338,000