Amount of cash inflow from the sale of other assets as part of operating activities.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 25

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3536-108585

Name:	us-gaap_ProceedsFromSaleOfOtherAssets1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Concentration of Customers and Gain on Sale of Rights in Wireless Spectrum (Details Textual) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended		3 Months Ended	9 Months Ended	12 Months Ended	9 Months Ended
	Apr. 30, 2014	Apr. 30, 2013	Apr. 30, 2014	Apr. 30, 2013	Jan. 31, 2013 Straight Path Spectrum [Member]	Apr. 30, 2013 Straight Path Spectrum [Member]	Jul. 31, 2012 Straight Path Spectrum [Member]	Apr. 30, 2013 Straight Path IP [Member]
Concentration Of Customers And Gain On Sale Of Rights In Wireless Spectrum (Textuals)
Cash Received from Exchange of Licenses							$ 6,800
Gain on Exchange of Licenses				$ 150	$ 200	$ 150	$ 5,300