Document and Entity Information	3 Months Ended
	Oct. 31, 2014	Dec. 08, 2014 Common Class A [Member]	Dec. 08, 2014 Common Class B [Member]
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-Q
Document Period End Date	Oct. 31, 2014
Document Fiscal Period Focus	Q1
Document Fiscal Year Focus	2015
Entity Filer Category	Accelerated Filer
Entity Common Stock, Shares Outstanding		787,163	11,163,271