XML 12 R1.htm IDEA: XBRL DOCUMENT v3.25.3
Cover - $ / shares
 3 Months Ended
Oct. 31, 2025
Dec. 05, 2025
Document Type 10-Q  
Amendment Flag false  
Document Quarterly Report true  
Document Transition Report false  
Document Period End Date Oct. 31, 2025  
Document Fiscal Period Focus Q1  
Document Fiscal Year Focus 2026  
Current Fiscal Year End Date --07-31  
Entity File Number 1-16371  
Entity Registrant Name IDT CORPORATION  
Entity Central Index Key 0001005731  
Entity Tax Identification Number 22-3415036  
Entity Incorporation, State or Country Code DE  
Entity Address, Address Line One 520 Broad Street  
Entity Address, City or Town Newark  
Entity Address, State or Province NJ  
Entity Address, Postal Zip Code 07102  
City Area Code (973)  
Local Phone Number 438-1000  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Large Accelerated Filer  
Entity Small Business false  
Entity Emerging Growth Company false  
Entity Shell Company false  
Common Class A [Member]    
Entity Common Stock, Shares Outstanding   1,574,326
Entity Listing, Par Value Per Share $ 0.01  
Common Class B [Member]    
Entity Common Stock, Shares Outstanding   23,499,021
Entity Listing, Par Value Per Share $ 0.01