Accumulated Other Comprehensive Loss (Tables)

12 Months Ended

Jul. 31, 2020

Stockholders' Equity Note [Abstract]

Schedule of accumulated balances for each classification of other comprehensive loss

(in thousands)	Unrealized (loss) gain on available-for- sale securities			Foreign currency translation			Accumulated other comprehensive loss
Balance at 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 at August 1, 2018		(1	)		(4,938	)		(4,939	)
Other comprehensive income attributable to IDT Corporation		1			80			81
Balance at July 31, 2019		—			(4,858	)		(4,858	)
Other comprehensive income (loss) attributable to IDT Corporation		42			(2,594	)		(2,552	)
BALANCE AT JULY 31, 2020	$	42		$	(7,452	)	$	(7,410	)