Document and Entity Information (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Jul. 31, 2013	Oct. 18, 2013 Common Class A [Member]	Oct. 18, 2013 Common Class B [Member]
Document and Entity Information [Abstract]
Entity Registrant Name	Straight Path Communications Inc.
Entity Central Index Key	0001574460
Amendment Flag	false
Current Fiscal Year End Date	--07-31
Document Type	10-K
Document Period End Date	Jul. 31, 2013
Document Fiscal Period Focus	FY
Document Fiscal Year Focus	2013
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Filer Category	Smaller Reporting Company
Entity Public Float	$ 0
Statement [Line Items]
Entity Common Stock, Shares Outstanding		787,163	10,974,784