Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jan. 31, 2016	Jan. 31, 2015	Jan. 31, 2016	Jan. 31, 2015
Statements of Operations [Abstract]
Revenues	$ 112	$ 2,781	$ 1,815	$ 7,604
Costs and expenses:
Direct cost of revenues	13	1,338	795	3,446
Research and development	374		374
Selling, general and administrative	2,346	1,605	3,958	2,708
Total costs and expenses	2,733	2,943	5,127	6,154
(Loss) income from operations	(2,621)	(162)	(3,312)	1,450
Other income:
Interest income	10	9	20	18
Other income	390		390	23
Total other income	400	9	410	41
(Loss) income before income taxes	$ (2,221)	(153)	(2,902)	1,491
Provision for income taxes		(100)	(6)	(855)
Net (loss) income	$ (2,221)	(253)	(2,908)	636
Net loss (income) attributable to noncontrolling interests	195	(24)	250	(207)
Net (loss) income attributable to Straight Path Communications Inc.	$ (2,026)	$ (277)	$ (2,658)	$ 429
(Loss) earnings per share attributable to Straight Path Communications Inc. stockholders:
Basic	$ (0.17)	$ (0.02)	$ (0.23)	$ 0.04
Diluted	$ (0.17)	$ (0.02)	$ (0.23)	$ 0.04
Weighted-average number of shares used in calculation of (loss) earnings per share:
Basic	11,854	11,420	11,832	11,409
Diluted	11,854	11,420	11,832	11,837