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Net Loss Per Share (Narrative) (Details)
 12 Months Ended
Sep. 30, 2014
Net Loss Per Share 1 4,200cbak_NetLossPerShareZeroTwoSixFiveZeroThreeOneThreeFivenBJzFgTwzsRd
Net Loss Per Share 2 100,000cbak_NetLossPerShareZeroTwoSixFiveZeroThreeOneThreeFiveOnegfFourSevenLpGnHdw
Net Loss Per Share 3 156,560cbak_NetLossPerShareZeroTwoSixFiveZeroThreeOneThreeFivevFourPEightKqSevenCLFourEightT
Net Loss Per Share 4 100,000cbak_NetLossPerShareZeroTwoSixFiveZeroThreeOneThreeFiveLfZeronSevenyPngvLEight