Document and Entity Information	6 Months Ended
	Jan. 31, 2015	Mar. 12, 2015
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	Jan. 31, 2015
Document Fiscal Year Focus	2015
Document Fiscal Period Focus	Q2
Entity Common Stock, Shares Outstanding		1,827,562