CONSOLIDATED STATEMENTS OF EQUITY (USD $) In Thousands, except Share data	Total	Accumulated Other Comprehensive Income (Loss) [Member]	Noncontrolling Interests [Member]	Receivable For Issuance Of Equity [Member]	IDT Corp [Member] Common Stock [Member]	IDT Corp [Member] Class A Common Stock [Member]	IDT Corp [Member] Class B Common Stock [Member]	IDT Corp [Member] Additional Paid-In Capital [Member]	IDT Corp [Member] Treasury Stock [Member]	IDT Corp [Member] Accumulated Other Comprehensive Income (Loss) [Member]	IDT Corp [Member] Accumulated Deficit [Member]
BALANCE at Jul. 31, 2009	$ 179,442		$ 3,148		$ 92	$ 33	$ 229	$ 720,804	$ (293,901)	$ 953	$ (251,916)
BALANCE, SHARES at Jul. 31, 2009					9,241,000	3,272,000	22,913,000
Restricted Class B common stock purchased from employee	(89)								(89)
Repurchases of common stock and Class B common stock through repurchase program	(1,790)								(1,790)
Exercise of stock options	90							(64)	154
Exercise of stock options, Shares							6,000
Stock-based compensation	2,541							2,541
Restricted stock issued to employees and directors							3	(3)
Restricted stock issued to employees and directors, shares							294,000
Sale of stock of subsidiary	5,490		3,075					2,415
Distributions to noncontrolling interests	(2,374)		(2,374)
CTM Spin-Off	(15,786)		(1,617)					(13,992)		(177)
Other comprehensive income (loss)	(1,824)	(1,793)	(31)							(1,793)
Net income for the year ended July	20,273		(17)								20,290
BALANCE at Jul. 31, 2010	185,973		2,184		92	33	232	711,701	(295,626)	(1,017)	(231,626)
BALANCE, SHARES at Jul. 31, 2010					9,241,000	3,272,000	23,213,000
Dividends declared	(15,178)										(15,178)
Restricted Class B common stock purchased from employee	(205)								(205)
Repurchases of common stock and Class B common stock through repurchase program	(7,499)								(7,499)
Exercise of stock options	1,674						1	1,827	(154)
Exercise of stock options, Shares							86,000
Stock-based compensation	4,791							4,791
Restricted stock issued to employees and directors							3	(3)
Restricted stock issued to employees and directors, shares							287,000
Sale of stock of subsidiary	10,011		(189)	(1,000)				11,200
Exchange of stock of subsidiaries	(1,301)		(968)					(333)
Distributions to noncontrolling interests	(2,010)		(2,010)
Exchange of Class B common stock from treasury shares for common stock					(92)			(208,451)	208,543
Exchange of Class B common stock from treasury shares for common stock, Shares					(9,241,000)
Other comprehensive income (loss)	4,163	4,044	119							4,044
Net income for the year ended July	23,371		(3,441)								26,812
BALANCE at Jul. 31, 2011	203,790		(4,305)	(1,000)		33	236	520,732	(94,941)	3,027	(219,992)
BALANCE, SHARES at Jul. 31, 2011						3,272,000	23,586,000
Dividends declared	(15,014)										(15,014)
Restricted Class B common stock purchased from employee	(210)								(210)
Repurchases of common stock and Class B common stock through repurchase program	(2,606)								(2,606)
Repurchases of common stock and Class B common stock through repurchase program
Stock-based compensation	3,605							3,605
Restricted stock issued to employees and directors							4	(4)
Restricted stock issued to employees and directors, shares							432,000
Stock issued for matching contributions to the 401(k) Plan	911						1	910
Stock issued for matching contributions to the 401(k) Plan, shares	92,843						94,000
Sale of stock of subsidiary	133		211					(78)
Distributions to noncontrolling interests	(1,580)		(1,580)
Other	225		225
CTM Spin-Off	(123,046)		5,688	1,000				(129,296)		(438)
Other comprehensive income (loss)	(2,268)	(2,387)	119							(2,387)
Net income for the year ended July	38,785		137								38,648
BALANCE at Jul. 31, 2012	$ 102,725		$ 495			$ 33	$ 241	$ 395,869	$ (97,757)	$ 202	$ (196,358)
BALANCE, SHARES at Jul. 31, 2012						3,272,000	24,112,000