Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Apr. 30, 2016	Apr. 30, 2015	Apr. 30, 2016	Apr. 30, 2015
Statements of Operations [Abstract]
Revenues	$ 219	$ 2,867	$ 2,034	$ 10,471
Costs and expenses:
Direct cost of revenues	88	$ 1,315	883	$ 4,761
Research and development	505		879
Selling, general and administrative	1,528	$ 1,353	5,486	$ 4,061
Total costs and expenses	2,121	2,668	7,248	8,822
(Loss) income from operations	(1,902)	199	(5,214)	1,649
Other income:
Interest income	10	$ 9	30	27
Other income	3		393	23
Total other income	13	$ 9	423	50
(Loss) income before income taxes	(1,889)	208	(4,791)	1,699
Provision for income tax benefits (income taxes)	25	801	19	(54)
Net (loss) income	(1,864)	1,009	(4,772)	1,645
Net loss (income) attributable to noncontrolling interests	19	(211)	269	(418)
Net (loss) income attributable to Straight Path Communications Inc.	$ (1,845)	$ 798	$ (4,503)	$ 1,227
(Loss) earnings per share attributable to Straight Path Communications Inc. stockholders:
Basic	$ (0.15)	$ 0.07	$ (0.38)	$ 0.11
Diluted	$ (0.15)	$ 0.07	$ (0.38)	$ 0.10
Weighted-average number of shares used in calculation of (loss) earnings per share:
Basic	11,905	11,449	11,856	11,426
Diluted	11,905	11,879	11,856	11,837