Equity (Tables)

9 Months Ended

Apr. 30, 2018

Equity [Abstract]

Summary of changes in the components of equity

	Nine Months Ended April 30, 2018
	Attributable to IDT Corporation			Noncontrolling Interests			Total
	(in thousands)
Balance, July 31, 2017	$	145,734		$	8,823		$	154,557
Dividends declared ($0.47 per share)		(11,677	)		—			(11,677	)
Restricted Class B common stock purchased from employees		(61	)		—			(61	)
Transfer of right to receive equity to Howard S. Jonas		—			(40	)		(40	)
Consolidation of Lipomedix Pharmaceuticals Ltd.		—			558			558
Distributions to noncontrolling interests		—			(1,023	)		(1,023	)
Rafael Spin-Off		(106,266	)		(8,653	)		(114,919	)
Stock-based compensation		2,842			—			2,842
Comprehensive loss:
Net loss		(4,034	)		698			(3,336	)
Other comprehensive income		16			—			16
Comprehensive loss		(4,018	)		698			(3,320	)
Balance, April 30, 2018	$	26,554		$	363		$	26,917