Other Operating Gains (Losses), Net - Summary of Other Operating Gains (Losses), Net by Business Segment (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
	Apr. 30, 2013	Jul. 31, 2014		Jul. 31, 2013		Jul. 31, 2012
Other Operating Gains, Net [Abstract]
Telecom Platform Services-gains (losses) related to legal matters, net		$ 650		$ 9,251		$ (6,698)
Telecom Platform Services-loss on settlement of litigation	9,600		[1]		[1]	(11,022)	[1]
Telecom Platform Services-gain on settlement of claim			[2]		[2]	1,750	[2]
Corporate-loss related to settlement		(79)	[3]		[3]		[3]
Corporate-other		(374)				100
All Other-gain on insurance claim		571	[4]		[4]		[4]
All Other-other		67
TOTAL		$ 835		$ 9,251		$ (15,870)

[1] On October 12, 2011, the Company entered into a binding term sheet with T-Mobile USA, Inc. ("T-Mobile") to settle litigation related to an alleged breach of a wholesale supply agreement. In consideration of the settlement of all disputes between the parties, on October 13, 2011, the Company paid T-Mobile $10 million. The Company incurred legal fees of $1.0 million in fiscal 2012 in connection with this matter.

[2] On January 17, 2012, the Company received $1.8 million from Broadstripe, LLC in settlement of the Company's claim stemming from Broadstripe, LLC's rejection of its telephony services agreements with the Company upon the confirmation of Broadstripe, LLC's bankruptcy plan and closing of its bankruptcy sale.

[3] In fiscal 2014, the Company incurred a loss of $0.1 million in connection with the June 2013 settlement of outstanding claims and disputes with the former Chief Executive Officer of Straight Path Spectrum, Inc. and his related parties.

[4] 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.