Severance Expense (Details) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended
	Jan. 31, 2016	Apr. 30, 2015	Jan. 31, 2015	Jan. 31, 2016	Jan. 31, 2015	Jul. 31, 2015
Severance Expense (Textual)
Severance expense			$ 351		$ 1,899
Accrued severance	$ 900			$ 900		$ 3,700
IDT Telecom [Member]
Severance Expense (Textual)
Severance expense		$ 6,200	$ 400		$ 1,900