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Document and Entity Information - shares	3 Months Ended
	Oct. 31, 2017	Dec. 07, 2017
Entity Registrant Name	IDT CORP
Entity Central Index Key	0001005731
Amendment Flag	false
Trading Symbol	IDT
Current Fiscal Year End Date	--07-31
Document Type	10-Q
Document Period End Date	Oct. 31, 2017
Document Fiscal Year Focus	2018
Document Fiscal Period Focus	Q1
Entity Filer Category	Accelerated Filer
Class A Common Stock
Entity Common Stock Shares Outstanding		1,574,326
Class B Common Stock
Entity Common Stock Shares Outstanding		23,266,555

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