Severance Expense (Details) - USD ($) $ in Thousands	3 Months Ended			12 Months Ended
	Jul. 31, 2016	Jul. 31, 2015	Apr. 30, 2015	Jul. 31, 2016	Jul. 31, 2015
Severance Expense (Textual)
Severance expense	$ 6,300	$ 200	$ 6,200	$ 6,510	$ 8,363
Accrued severance	100	$ 3,700		100	3,700
IDT Telecom [Member]
Severance Expense (Textual)
Severance expense					$ 1,900
Workforce reduction [Member]
Severance Expense (Textual)
Severance expense				6,300
Accrued severance	$ 5,700			5,700
Unrelated to workforce reduction [Member]
Severance Expense (Textual)
Severance expense				$ 200