Business Segment Information (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jan. 31, 2015	Jan. 31, 2014	Jan. 31, 2015	Jan. 31, 2014
Summary of operating results for the business segments
Revenues	$ 2,781	$ 453	$ 7,604	$ 580
Income (loss) from operations	(162)	(872)	1,450	(1,342)
Straight Path Spectrum [Member]
Summary of operating results for the business segments
Revenues	93	109	189	216
Income (loss) from operations	(412)	(175)	(709)	(235)
Straight Path IP [Member]
Summary of operating results for the business segments
Revenues	2,688	344	7,415	364
Income (loss) from operations	$ 250	$ (697)	$ 2,159	$ (1,107)