Other Operating Gains (Loss), Net - Schedule of Other Operating Gains Loss Net (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended				6 Months Ended
	Jan. 31, 2014		Jan. 31, 2013		Jan. 31, 2014		Jan. 31, 2013
Other Operating Gains (Loss) and Other (Expense) Income, Net [Abstract]
Telecom Platform Services-gain (loss) related to legal matters	$ 350				$ 650		$ (350)
All Other-gain on insurance claim (a)		[1]		[1]	571	[1]		[1]
All Other-other					67
Corporate-loss related to settlement (b)		[2]		[2]	(79)	[2]		[2]
TOTAL	$ 350				$ 1,209		$ (350)

[1] (a) In the six months ended January 31, 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.

[2] (b) In the six months ended January 31, 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. In the fourth quarter of fiscal 2013, Straight Path Spectrum, Inc. paid $1.5 million to those parties in connection with the settlement.