Revenue Recognition (Details Textual) - USD ($) $ in Thousands		12 Months Ended
	Aug. 02, 2018	Jul. 31, 2019	Jul. 31, 2018
Revenue Recognition (Textual)
Cumulative effect adjustment	$ 9,100
Contract liability balance		$ 41,300
Deferred income tax assets		4,589	$ 5,668
Accumulated deficit		(160,763)	$ (173,103)
Other current assets		1,500
Other assets		1,700
Amortization of deferred costs		1,800
Deferred costs		$ 3,200
ASC 606 [Member] | Net2phone-UCaaS business [Member]
Revenue Recognition (Textual)
Cumulative effect adjustment	1,300
Accumulated deficit	(1,300)
Other current assets	600
Other assets	700
ASC 606 [Member] | Breakage Revenue [Member]
Revenue Recognition (Textual)
Cumulative effect adjustment	8,600
Deferred revenue	(8,600)
Deferred income tax assets	(800)
Accumulated deficit	$ (7,800)