Consolidated Statements of Operations (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Oct. 31, 2014	Oct. 31, 2013
Statements of Operations [Abstract]
Revenues	$ 4,823	$ 127
Costs and expenses:
Direct cost of revenues	2,108	28
Selling, general and administrative	1,103	569
Total costs and expenses	3,211	597
Income (loss) from operations	1,612	(470)
Other income:
Interest income	9	3
Other income	23
Income from IDT Corporation payments of liabilities		50
Total other income	32	53
Income (loss) before income taxes	1,644	(417)
Provision for income taxes	(755)
Net income (loss)	889	(417)
Net (income) loss attributable to noncontrolling interests	(183)	26
Net income (loss) attributable to Straight Path Communications Inc.	$ 706	$ (391)
Earnings (loss) per share attributable to Straight Path Communications Inc. stockholders:
Basic	$ 0.06	$ (0.04)
Diluted	$ 0.06	$ (0.04)
Weighted-average number of shares used in calculation of earnings (loss) per share:
Basic	11,398	10,508
Diluted	11,803	10,508