Business Segment Information (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Oct. 31, 2014	Oct. 31, 2013
Summary of operating results for the business segments
Revenues	$ 4,823	$ 127
Income (loss) from operations	1,612	(470)
Straight Path Spectrum [Member]
Summary of operating results for the business segments
Revenues	96	107
Income (loss) from operations	(297)	(60)
Straight Path IP [Member]
Summary of operating results for the business segments
Revenues	4,727	20
Income (loss) from operations	$ 1,909	$ (410)