Business Segment Information (Details Textual) (USD $)	2 Months Ended	3 Months Ended		9 Months Ended
	Apr. 30, 2012	Apr. 30, 2013	Apr. 30, 2012	Apr. 30, 2013 Spectrum_license Segment	Apr. 30, 2012
Segment Reporting (Textual)
Loss from settlement of litigation					$ (11,022,000)
Gain from settlement of a claim				200,000
Gain on sale of wireless spectrum	5,300,000		5,300,000		5,330,000
Number of reportable segments				2
Number of wireless spectrum licenses sold				8
Broadstripe LLC [Member]
Segment Reporting (Textual)
Loss from settlement of litigation					1,800,000
Telecom Platform Services [Member]
Segment Reporting (Textual)
Losses related to pending litigation or other legal matters			6,500,000		6,700,000
Gains related to pending litigation or other legal matters		9,600,000		9,300,000
Telecom Platform Services [Member] | T- Mobile [Member]
Segment Reporting (Textual)
Loss from settlement of litigation					$ (11,000,000)