XML 15 R1.htm IDEA: XBRL DOCUMENT v3.3.1.900
Document and Entity Information - USD ($)
 12 Months Ended
Sep. 30, 2015
Jan. 08, 2016
Mar. 31, 2015
Document Type 10-K    
Amendment Flag false    
Document Period End Date Sep. 30, 2015    
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   17,145,493  
Entity Current Reporting Status Yes    
Entity Voluntary Filers No    
Entity Well Known Seasoned Issuer No    
Entity Public Float     $ 30,600,000
Document Fiscal Year Focus 2015    
Document Fiscal Period Focus FY