Cover - USD ($) $ in Millions |
12 Months Ended | ||
|---|---|---|---|
Jul. 31, 2025 |
Sep. 24, 2025 |
Jan. 31, 2025 |
|
| Document Type | 10-K | ||
| Amendment Flag | false | ||
| Document Annual Report | true | ||
| Document Transition Report | false | ||
| Document Period End Date | Jul. 31, 2025 | ||
| Document Fiscal Period Focus | FY | ||
| Document Fiscal Year Focus | 2025 | ||
| 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 | ||
| Title of 12(b) Security | Class B common stock, par value $0.01 per share | ||
| Trading Symbol | IDT | ||
| Security Exchange Name | NYSE | ||
| Entity Well-known Seasoned Issuer | No | ||
| Entity Voluntary Filers | No | ||
| 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 | ||
| Entity Public Float | $ 884.8 | ||
| Documents Incorporated by Reference [Text Block] | The definitive proxy statement relating to the registrant’s Annual Meeting of Stockholders, to be held December 11, 2025, is incorporated by reference into Part III of this Form 10-K to the extent described therein. | ||
| ICFR Auditor Attestation Flag | true | ||
| Document Financial Statement Error Correction [Flag] | false | ||
| Auditor Firm ID | 248 | ||
| Auditor Opinion [Text Block] | We have audited the accompanying consolidated balance sheets of IDT Corporation (a Delaware corporation) and subsidiaries (the “Company”) as of July 31, 2025 and 2024, the related consolidated statements of income, comprehensive income, equity, and cash flows for each of the three years in the period ended July 31, 2025, and the related notes (collectively referred to as the “consolidated financial statements”). In our opinion, the consolidated financial statements present fairly, in all material respects, the financial position of the Company as of July 31, 2025 and 2024, and the results of its operations and its cash flows for each of the three years in the period ended July 31, 2025, in conformity with accounting principles generally accepted in the United States of America.We also have audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States) (“PCAOB”), the Company’s internal control over financial reporting as of July 31, 2025, based on criteria established in the 2013 Internal Control—Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission (“COSO”), and our report dated September 29, 2025 expressed an unqualified opinion. | ||
| Auditor Name | GRANT THORNTON LLP | ||
| Auditor Location | New York, New York | ||
| Common Class B [Member] | |||
| Entity Common Stock, Shares Outstanding | 23,656,689 | ||
| Common Class A [Member] | |||
| Entity Common Stock, Shares Outstanding | 1,574,326 |