Document And Entity Information	9 Months Ended
	Apr. 30, 2013	Jun. 14, 2013
Document and Entity Information [Abstract]
Entity Registrant Name	Lightlake Therapeutics Inc.
Document Type	10-Q
Current Fiscal Year End Date	--07-31
Amendment Flag	false
Entity Central Index Key	0001385508
Entity Filer Category	Smaller Reporting Company
Document Period End Date	Apr. 30, 2013
Document Fiscal Year Focus	2013
Document Fiscal Period Focus	Q3
Entity Common Stock, Shares Outstanding		155,280,791