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Deferred Revenue (Narrative) (Details) | 12 Months Ended
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Sep. 30, 2012 Y
Deferred Revenue 2 | 35

X
- Definition Deferred Revenue 2 + References No definition available. + Details
Name: | cbak_DeferredRevenueZeroOneZeroSevenSixOneFourSevenEightgGNinenSixKWbFiveqGk
Namespace Prefix: | cbak_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | duration