Document and Entity Information (USD $)
12 Months Ended
Jul. 31, 2014
Oct. 23, 2014
Jan. 31, 2014
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 Filer Category Smaller Reporting Company    
Entity Well-known Seasoned Issuer No    
Document Period End Date Jul. 31, 2014    
Document Fiscal Year Focus 2014    
Document Fiscal Period Focus FY    
Entity Common Stock, Shares Outstanding   179,608,675  
Entity Public Float     $ 9,759,032