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Document And Entity Information (USD $)
 12 Months Ended
Sep. 30, 2013
May 31, 2014
Mar. 29, 2013
Document and Entity Information [Abstract]      
Entity Registrant Name DAILY JOURNAL CORP    
Document Type 10-K    
Current Fiscal Year End Date --09-30    
Entity Common Stock, Shares Outstanding   1,380,746  
Entity Public Float     $ 98,251,000
Amendment Flag false    
Entity Central Index Key 0000783412    
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 Sep. 30, 2013    
Document Fiscal Year Focus 2013    
Document Fiscal Period Focus FY