Other Operating (Losses) Gains, Net (Details) - USD ($) $ in Thousands		3 Months Ended	12 Months Ended
		Apr. 30, 2015	Jul. 31, 2016	Jul. 31, 2015	Jul. 31, 2014
Other Operating (Losses) Gains Net
Telecom Platform Services-loss on disposal of property, plant and equipment			$ (326)
Telecom Platform Services-gains related to legal matters, net					650
Corporate-losses related to legal matters				(1,552)	(79)
Corporate-other					(374)
All Other-gain on insurance claim (a)	[1]				571
All Other-other					67
Total		$ 1,600	$ (326)	$ (1,552)	$ 835

[1] In fiscal 2014, the Company received proceeds from insurance of $0.6 million related to water damage to portions of the Company's building and improvements at 520 Broad Street, Newark, New Jersey. The damage occurred in a prior period. The Company recorded a gain of $0.6 million from this insurance claim.