Consolidated Statements of Equity (Unaudited) - USD ($) $ in Thousands	IDT Corporation Stockholders Class A Common Stock	IDT Corporation Stockholders Class B Common Stock	IDT Corporation Stockholders Additional Paid-In Capital	IDT Corporation Stockholders Treasury Stock	IDT Corporation Stockholders Accumulated Other Comprehensive Loss	IDT Corporation Stockholders Accumulated Deficit	Noncontrolling Interests	Total
Beginning Balance at Jul. 31, 2018	$ 33	$ 256	$ 294,047	$ (85,597)	$ (4,972)	$ (173,103)	$ 639	$ 31,303
Adjustment from the adoption of change in revenue recognition						9,064		9,064
Adjustment from the adoption of change in accounting for equity investments					33	1,140		1,173
BALANCE AT AUGUST 1, 2018 at Jul. 31, 2018	33	256	294,047	(85,597)	(4,939)	(162,899)	639	41,540
Repurchases of Class B common stock through repurchase program				(3,854)				(3,854)
Sale of Class B common stock to Howard S. Jonas			(22,968)	37,740				14,772
Restricted Class B common stock purchased from employees				(16)				(16)
Stock-based compensation			880					880
Distributions to noncontrolling interests							(737)	(737)
Other comprehensive loss					484			484
Net income (loss)						(3,610)	601	(3,009)
Ending Balance at Jan. 31, 2019	33	256	271,959	(51,727)	(4,455)	(166,509)	503	50,060
Beginning Balance at Oct. 31, 2018	33	256	294,460	(89,451)	(4,417)	(165,198)	601	36,284
Sale of Class B common stock to Howard S. Jonas			(22,968)	37,740				14,772
Restricted Class B common stock purchased from employees				(16)				(16)
Stock-based compensation			467					467
Distributions to noncontrolling interests							(398)	(398)
Other comprehensive loss					(38)			(38)
Net income (loss)						(1,311)	300	(1,011)
Ending Balance at Jan. 31, 2019	33	256	271,959	(51,727)	(4,455)	(166,509)	503	50,060
Beginning Balance at Jul. 31, 2019	33	258	273,313	(51,739)	(4,858)	(160,763)	(2,687)	53,557
Exercise of stock options			276					276
Restricted Class B common stock purchased from employees				(266)				(266)
Stock-based compensation		2	2,529					2,531
Distributions to noncontrolling interests							(470)	(470)
Other comprehensive loss					(1,717)			(1,717)
Net income (loss)						(581)	63	(518)
Ending Balance at Jan. 31, 2020	33	260	276,118	(52,005)	(6,575)	(161,344)	(3,094)	53,393
Beginning Balance at Oct. 31, 2019	33	258	274,953	(51,739)	(6,062)	(162,276)	(2,836)	52,331
Restricted Class B common stock purchased from employees				(266)				(266)
Stock-based compensation		2	1,165					1,167
Distributions to noncontrolling interests							(230)	(230)
Other comprehensive loss					(513)			(513)
Net income (loss)						932	(28)	904
Ending Balance at Jan. 31, 2020	$ 33	$ 260	$ 276,118	$ (52,005)	$ (6,575)	$ (161,344)	$ (3,094)	$ 53,393