Combined and Consolidated Statements of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Oct. 31, 2013	Oct. 31, 2012
Statements of Operations [Abstract]
Revenues	$ 127	$ 468
Costs and expenses:
Direct cost of revenues	28	306
Selling, general and administrative	569	1,636
Total costs and expenses	597	1,942
Loss from operations	(470)	(1,474)
Interest income	3	3
Income from IDT Corporation payments of liabilities	50
Loss before income taxes	(417)	(1,471)
(Provision for) benefit from income taxes
Net loss	(417)	(1,471)
Net loss attributable to noncontrolling interests	26	210
Net loss attributable to Straight Path Communications Inc.	$ (391)	$ (1,261)
Basic and diluted loss per share attributable to Straight Path Communications Inc. stockholders	$ (0.04)	$ (0.11)
Weighted-average number of shares used in calculation of basic and diluted loss per share	10,508	11,417