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Share-based Compensation (Narrative) (Details) (USD $) | 12 Months Ended
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Sep. 30, 2014 Y
Share-based Compensation 1 | 800,000 cbak_SharebasedCompensationZeroTwoSixFiveZeroThreeOneThreeFiveZRyDSixfZSevenZTwoTC
Share-based Compensation 2 | 1,600,000 cbak_SharebasedCompensationZeroTwoSixFiveZeroThreeOneThreeFivenMNXSevenssSixtThreeSN
Share-based Compensation 3 | 385,640 cbak_SharebasedCompensationZeroTwoSixFiveZeroThreeOneThreeFiveEightFiveSixNPSixKcZMPm
Share-based Compensation 4 | $ 14.05 cbak_SharebasedCompensationZeroTwoSixFiveZeroThreeOneThreeFiveThreeSfThreeJxEightbvOnekFive
Share-based Compensation 5 | 7 cbak_SharebasedCompensationZeroTwoSixFiveZeroThreeOneThreeFiveGmNZeroFFourJwkhkp
Share-based Compensation 6 | $ 2.99 cbak_SharebasedCompensationZeroTwoSixFiveZeroThreeOneThreeFiveNxRSevenOneFVwClZerot
Share-based Compensation 7 | $ 14.05 cbak_SharebasedCompensationZeroTwoSixFiveZeroThreeOneThreeFiveLXTwoNineHdSNnZVEight
Share-based Compensation 8 | $ 12.30 cbak_SharebasedCompensationZeroTwoSixFiveZeroThreeOneThreeFiveSixWFHZerokJJSevenXzL
Share-based Compensation 9 | 259,207 cbak_SharebasedCompensationZeroTwoSixFiveZeroThreeOneThreeFiveNinekpZTwTJThreerNSeven
Share-based Compensation 10 | 65,147 cbak_SharebasedCompensationZeroTwoSixFiveZeroThreeOneThreeFiveVFourNQNinezNinePfNSf
Share-based Compensation 11 | 20,000 cbak_SharebasedCompensationZeroTwoSixFiveZeroThreeOneThreeFiveNineDBBSrMhFourFourSTwo
Share-based Compensation 12 | $ 12.15 cbak_SharebasedCompensationZeroTwoSixFiveZeroThreeOneThreeFivekBJmxtqdLTZerox
Share-based Compensation 13 | 7.5 cbak_SharebasedCompensationZeroTwoSixFiveZeroThreeOneThreeFiventfZnPVXlzZeroH
Share-based Compensation 14 | $ 7.05 cbak_SharebasedCompensationZeroTwoSixFiveZeroThreeOneThreeFivekRSevenQlGrTSixBQJ
Share-based Compensation 15 | 8,703 cbak_SharebasedCompensationZeroTwoSixFiveZeroThreeOneThreeFivedFiveZzBtZfZSFiveq
Share-based Compensation 16 | 0 cbak_SharebasedCompensationZeroTwoSixFiveZeroThreeOneThreeFiveJxwOnezgkRTwoTGl
Share-based Compensation 17 | 100,000 cbak_SharebasedCompensationZeroTwoSixFiveZeroThreeOneThreeFivenlghyWtryKrJ
Share-based Compensation 18 | $ 14.05 cbak_SharebasedCompensationZeroTwoSixFiveZeroThreeOneThreeFiveRyLFtTvcxSevenNv
Share-based Compensation 19 | 91,096 cbak_SharebasedCompensationZeroTwoSixFiveZeroThreeOneThreeFivewlRNQTwobPkkzL
Share-based Compensation 20 | $ 23,598 cbak_SharebasedCompensationZeroTwoSixFiveZeroThreeOneThreeFivevNpmWyRlDqFJ

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