Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Apr. 30, 2017	Apr. 30, 2016	Apr. 30, 2017	Apr. 30, 2016
Statements of Operations [Abstract]
Revenues	$ 167	$ 219	$ 491	$ 2,034
Costs and expenses:
Direct cost of revenues	32	88	99	883
Research and development	144	505	433	879
Selling, general and administrative (related party of $2, $0, $207, and $0)	3,996	1,528	11,827	5,486
Total costs and expenses	4,172	2,121	12,359	7,248
Loss from operations before item listed below	(4,005)	(1,902)	(11,868)	(5,214)
Civil penalty - FCC consent decree			(15,000)
Stockholder settlement			(7,200)
Loss from operations	(4,005)	(1,902)	(34,068)	(5,214)
Other income (expense):
Interest expense, including amortization of debt discounts	(2,195)		(2,195)
Interest income	7	10	20	30
Other income		3	22	393
Total other income (expense)	(2,188)	13	(2,153)	423
Loss before income tax benefits (income taxes)	(6,193)	(1,889)	(36,221)	(4,791)
Provision for income tax benefits (income taxes)	(3)	25	(10)	19
Net loss	(6,196)	(1,864)	(36,231)	(4,772)
Net loss attributable to noncontrolling interests	203	19	682	269
Net loss attributable to Straight Path Communications Inc.	$ (5,993)	$ (1,845)	$ (35,549)	$ (4,503)
Loss per share attributable to Straight Path Communications Inc. stockholders:
Basic and diluted	$ (0.49)	$ (0.15)	$ (2.93)	$ (0.38)
Weighted-average number of shares used in calculation of loss per share:
Basic and diluted	12,186	11,905	12,117	11,856