Consolidated Statements of Operations (Unaudited) - USD ($) $ in Thousands		3 Months Ended
		Oct. 31, 2019	Oct. 31, 2018
Income Statement [Abstract]
Revenues		$ 340,245	$ 362,316
Costs and expenses:
Direct cost of revenues (exclusive of depreciation and amortization)		279,461	304,693
Selling, general and administrative	[1]	53,480	50,552
Depreciation and amortization		5,295	5,594
Severance		626
Total costs and expenses		338,862	360,839
Other operating expense, net (see Note 9)		(2,775)	(1,295)
(Loss) income from operations		(1,392)	182
Interest income, net		272	108
Other income (expense), net		234	(1,349)
Loss before income taxes		(886)	(1,059)
Provision for income taxes		(536)	(939)
Net loss		(1,422)	(1,998)
Net income attributable to noncontrolling interests		(91)	(301)
Net loss attributable to IDT Corporation		$ (1,513)	$ (2,299)
Basic and diluted loss per share attributable to IDT Corporation common stockholders		$ (0.06)	$ (0.1)
Weighted-average number of shares used in calculation of basic and diluted loss per share		26,279	23,831
(i) Stock-based compensation included in selling, general and administrative expenses		$ 1,364	$ 413

[1] Stock-based compensation included in selling, general and administrative expenses