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Income Tax and New Jersey Corporation Business Tax	3 Months Ended
	Oct. 31, 2017
Income Tax and New Jersey Corporation Business Tax [Abstract]
Income Tax and New Jersey Corporation Business Tax	Note 13—Income Tax and New Jersey Corporation Business Tax In the three months ended October 31, 2016, the Company determined that its valuation allowance on the losses of Elmion Netherlands B.V., a Netherlands subsidiary, was no longer required due to an internal reorganization that generated income and a projection of income in future periods. The Company recorded a benefit from income taxes of $16.6 million in the three months ended October 31, 2016 from the full recognition of the Elmion Netherlands B.V. deferred tax assets. In September 2017, the Company, IDT Domestic Telecom, Inc. (a subsidiary of the Company) and certain other affiliates, were certified by the New Jersey Economic Development Authority as having met all of the requirements of the Grow New Jersey Assistance Act Tax Credit Program. The corporation business tax credits to be received are a maximum of $21.1 million. The Company may claim a tax credit each tax year for ten years beginning in 2017. The tax credit can be applied to 100% of the Company’s New Jersey tax liability each year, and the unused amount of the annual credit can be carried forward. In addition, the Company may apply for a tax credit transfer certificate to sell unused tax credits to another business. The tax credits must be sold for no less than 75% of the value of the tax credits. The tax credits are subject to reduction, forfeiture and recapture if, among other things, the number of full-time employees declines below the program or statewide minimum.

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- Definition

The entire disclosure for income taxes. Disclosures may include net deferred tax liability or asset recognized in an enterprise's statement of financial position, net change during the year in the total valuation allowance, approximate tax effect of each type of temporary difference and carryforward that gives rise to a significant portion of deferred tax liabilities and deferred tax assets, utilization of a tax carryback, and tax uncertainties information.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-URI http://asc.fasb.org/topic&trid=2144680

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