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Concentrations and Credit Risk (Narrative) (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Sep. 30, 2014
Concentrations And Credit Risk 1 | 10.00%cbak_ConcentrationsAndCreditRiskZeroTwoSixFiveZeroThreeOneThreeFivehLDLzVfOneZeropkG
Concentrations And Credit Risk 2 | 10.00%cbak_ConcentrationsAndCreditRiskZeroTwoSixFiveZeroThreeOneThreeFiveHhbSevenTwoQNvpTwoKm
Concentrations And Credit Risk 3 | 10.00%cbak_ConcentrationsAndCreditRiskZeroTwoSixFiveZeroThreeOneThreeFiveNineThreeHTwoQzhtBmRT
Concentrations And Credit Risk 4 | 10.00%cbak_ConcentrationsAndCreditRiskZeroTwoSixFiveZeroThreeOneThreeFiveFourZeroBQZeroQThreezcsrr
Concentrations And Credit Risk 5 | $ 3.3 cbak_ConcentrationsAndCreditRiskZeroTwoSixFiveZeroThreeOneThreeFiveZerodSevenFEightRSixhEightLyOne

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- Definition Concentrations And Credit Risk 4 + References No definition available. + Details
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Data Type: | num:percentItemType
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- Definition Concentrations And Credit Risk 2 + References No definition available. + Details
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- Definition Concentrations And Credit Risk 1 + References No definition available. + Details
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Data Type: | num:percentItemType
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- Definition Concentrations And Credit Risk 3 + References No definition available. + Details
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Data Type: | num:percentItemType
Balance Type: | na
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X
- Definition Concentrations And Credit Risk 5 + References No definition available. + Details
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Namespace Prefix: | cbak_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
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