Commitments and Contingencies (Details Textual) - USD ($) $ in Thousands	9 Months Ended
	Apr. 30, 2016	Jul. 31, 2015
Commitments and Contingencies (Textual)
Purchase commitment of company	$ 1,900
Letters of credit outstanding	200
Performance bonds outstanding	13,300
Customer deposits	96,109	$ 84,454
IDT Payment Services and IDT Financial Services Ltd. [Member]
Commitments and Contingencies (Textual)
Restricted cash and cash equivalents	$ 9,100	$ 7,500
Expire on April 31, 2017 [Member]
Commitments and Contingencies (Textual)
Letters of credit expiration date	Apr. 30, 2017