Combined and Consolidated Statements of Operations (Unaudited) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jan. 31, 2014	Jan. 31, 2013	Jan. 31, 2014	Jan. 31, 2013
Statements of Operations [Abstract]
Revenues	$ 453	$ 229	$ 580	$ 697
Costs and expenses:
Direct cost of revenues	283	104	311	410
Selling, general and administrative	1,042	683	1,611	2,319
Total costs and expenses	1,325	787	1,922	2,729
Gain on sale of rights in wireless spectrum		150		150
Loss from operations	(872)	(408)	(1,342)	(1,882)
Interest income	4	3	7	6
Income from IDT Corporation payments of liabilities			50
Loss before income taxes	(868)	(405)	(1,285)	(1,876)
Provision for income taxes		(12)		(12)
Net loss	(868)	(417)	(1,285)	(1,888)
Net loss attributable to noncontrolling interests	141	81	167	291
Net loss attributable to Straight Path Communications Inc.	$ (727)	$ (336)	$ (1,118)	$ (1,597)
Basic and diluted loss per share attributable to Straight Path Communications Inc. stockholders	$ (0.07)	$ (0.03)	$ (0.11)	$ (0.14)
Weighted-average number of shares used in calculation of basic and diluted loss per share	10,784	11,425	10,646	11,425