Document And Entity Information (USD $)	12 Months Ended
	Jul. 31, 2013	Oct. 23, 2013	Jan. 31, 2013
Document and Entity Information [Abstract]
Entity Registrant Name	Lightlake Therapeutics Inc.
Document Type	10-K
Current Fiscal Year End Date	--07-31
Amendment Flag	false
Entity Central Index Key	0001385508
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Well-known Seasoned Issuer	No
Entity Filer Category	Smaller Reporting Company
Document Period End Date	Jul. 31, 2013
Document Fiscal Year Focus	2013
Document Fiscal Period Focus	FY
Entity Public Float			$ 10,488,187
Entity Common Stock, Shares Outstanding		168,800,210