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Concentrations and Credit Risk (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
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 $ 3.3cbak_ConcentrationsAndCreditRiskZeroTwoSixFiveZeroThreeOneThreeFiveZerodSevenFEightRSixhEightLyOne