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Document and Entity Information (USD $)
 12 Months Ended
Aug. 31, 2014
Oct. 17, 2014
Feb. 28, 2014
Document Document And Entity Information [Abstract]      
Document Type 10-K    
Amendment Flag false    
Document Period End Date Aug. 31, 2014    
Document Fiscal Year Focus 2014    
Document Fiscal Period Focus FY    
Entity Registrant Name WD 40 CO    
Trading Symbol wdfc    
Entity Central Index Key 0000105132    
Current Fiscal Year End Date --08-31    
Entity Current Reporting Status Yes    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Filer Category Large Accelerated Filer    
Entity Common Stock, Shares Outstanding   14,631,670  
Entity Public Float     $ 1,028,029,906