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Business Segment Information (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Apr. 30, 2015	Apr. 30, 2014	Apr. 30, 2015	Apr. 30, 2014
Summary of operating results for the business segments
Revenues	$ 2,867us-gaap_Revenues	$ 913us-gaap_Revenues	$ 10,471us-gaap_Revenues	$ 1,493us-gaap_Revenues
Income (loss) from operations	199us-gaap_OperatingIncomeLoss	(177)us-gaap_OperatingIncomeLoss	1,649us-gaap_OperatingIncomeLoss	(1,519)us-gaap_OperatingIncomeLoss
Straight Path Spectrum [Member]
Summary of operating results for the business segments
Revenues	99	109	288	325
Income (loss) from operations	(353)	(117)	(1,062)	(352)
Straight Path IP [Member]
Summary of operating results for the business segments
Revenues	2,768	804	10,183	1,168
Income (loss) from operations	$ 552	$ (60)	$ 2,711	$ (1,167)