Document And Entity Information	6 Months Ended
	Jan. 31, 2013	Mar. 18, 2013
Document and Entity Information [Abstract]
Entity Registrant Name	Lightlake Therapeutics Inc.
Document Type	10-Q
Current Fiscal Year End Date	--07-31
Entity Common Stock, Shares Outstanding		139,458,798
Amendment Flag	false
Entity Central Index Key	0001385508
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Filer Category	Smaller Reporting Company
Entity Well-known Seasoned Issuer	No
Document Period End Date	Jan. 31, 2013
Document Fiscal Year Focus	2013
Document Fiscal Period Focus	Q2