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Document and Entity Information - USD ($)
 12 Months Ended
Aug. 31, 2015
Oct. 19, 2015
Feb. 28, 2015
Document Document And Entity Information [Abstract]      
Document Type 10-K    
Amendment Flag false    
Document Period End Date Aug. 31, 2015    
Document Fiscal Year Focus 2015    
Document Fiscal Period Focus FY    
Trading Symbol wdfc    
Entity Registrant Name WD 40 CO    
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 Public Float     $ 1,144,737,138
Entity Common Stock, Shares Outstanding   14,374,181