Accumulated Other Comprehensive Loss (Tables)

6 Months Ended

Jan. 31, 2020

Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]

Schedule of accumulated balances for each classification of other comprehensive loss

	Unrealized Gain (Loss) on Available-for-Sale Securities		Foreign Currency Translation			Accumulated Other Comprehensive Loss
	(in thousands)
Balance, July 31, 2019	$	—	$	(4,858	)	$	(4,858	)
Other comprehensive loss attributable to IDT Corporation		—		(1,717	)		(1,717	)
Balance, January 31, 2020	$	—	$	(6,575	)	$	(6,575	)