Combined and Consolidated Statements of Operations (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Apr. 30, 2014	Apr. 30, 2013	Apr. 30, 2014	Apr. 30, 2013
Statements of Operations [Abstract]
Revenues	$ 913	$ 285	$ 1,493	$ 982
Costs and expenses:
Direct cost of revenues	425	188	736	598
Selling, general and administrative	665	985	2,276	3,303
Total costs and expenses	1,090	1,173	3,012	3,901
Gain on sale of rights in wireless spectrum				150
Loss from operations	(177)	(888)	(1,519)	(2,769)
Interest income	6	3	13	8
Income from IDT Corporation payments of liabilities	332		383
Income (loss) before income taxes	161	(885)	(1,123)	(2,761)
(Provision for) benefit from income taxes	(40)	5	(40)	(7)
Net income (loss)	121	(880)	(1,163)	(2,768)
Net (income) loss attributable to noncontrolling interests	(4)	21	163	313
Net income (loss) attributable to Straight Path Communications Inc.	$ 117	$ (859)	$ (1,000)	$ (2,455)
Earnings (loss) per share attributable to Straight Path Communications Inc. stockholders:
Basic	$ 0.01	$ (0.08)	$ (0.09)	$ (0.21)
Diluted	$ 0.01	$ (0.08)	$ (0.09)	$ (0.21)
Weighted-average number of shares used in calculation of earnings (loss) per share:
Basic	11,339	11,424	10,878	11,424
Diluted	11,649	11,424	10,878	11,424