Accumulated Other Comprehensive Loss (Tables)

6 Months Ended

Jan. 31, 2019

Accumulated Other Comprehensive Loss [Abstract]

Schedule of accumulated balances for each classification of other comprehensive income (loss)

	Unrealized Gain (Loss) on Available-for-Sale Securities			Foreign Currency Translation			Accumulated Other Comprehensive Loss
	(in thousands)
Balance, July 31, 2018	$	(34	)	$	(4,938	)	$	(4,972	)
Adjustment from the adoption of change in accounting for equity investments (see Note 8)		33			—			33
Adjusted balance, August 1, 2018		(1	)		(4,938	)		(4,939	)
Other comprehensive income attributable to IDT Corporation		1			483			484
Balance, January 31, 2019	$	—		$	(4,455	)	$	(4,455	)