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Deferred Revenue (Narrative) (Details) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Sep. 30, 2013 USD ($) Y | Sep. 30, 2013 CNY
Deferred Revenue 1 | $ 9 |
Deferred Revenue 2 |  | 56
Deferred Revenue 3 | 35 | 35

X
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X
- Definition Deferred Revenue 3 + References No definition available. + Details
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X
- Definition Deferred Revenue 1 + References No definition available. + Details
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Namespace Prefix: | cbak_
Data Type: | xbrli:monetaryItemType
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