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Document and Entity Information - USD ($)
 12 Months Ended
Sep. 30, 2016
Jan. 09, 2017
Mar. 31, 2016
Document Type 10-K    
Amendment Flag false    
Document Period End Date Sep. 30, 2016    
Trading Symbol cbak    
Entity Registrant Name CHINA BAK BATTERY INC    
Entity Central Index Key 0001117171    
Current Fiscal Year End Date --09-30    
Entity Filer Category Smaller Reporting Company    
Entity Common Stock, Shares Outstanding   19,600,469  
Entity Current Reporting Status Yes    
Entity Voluntary Filers No    
Entity Well Known Seasoned Issuer No    
Entity Public Float     $ 25,800,000
Document Fiscal Year Focus 2016    
Document Fiscal Period Focus FY