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Share-based Compensation (Narrative) (Details) (USD $) | 3 Months Ended
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Dec. 31, 2014 Y
Share-based Compensation 1 | 800,000 cbak_SharebasedCompensationZeroTwoSixEightNineThreeOneSevenNineSixWFFourFTHCXxks
Share-based Compensation 2 | 1,600,000 cbak_SharebasedCompensationZeroTwoSixEightNineThreeOneSevenNinerwCfSgGdTwoDQz
Share-based Compensation 3 | 385,640 cbak_SharebasedCompensationZeroTwoSixEightNineThreeOneSevenNineNvwyJxNineOneMxSixk
Share-based Compensation 4 | $ 14.05 cbak_SharebasedCompensationZeroTwoSixEightNineThreeOneSevenNineqFZeroMRsCDThreeqDOne
Share-based Compensation 5 | 7 cbak_SharebasedCompensationZeroTwoSixEightNineThreeOneSevenNineZqThreeRSJBSLzNl
Share-based Compensation 6 | $ 1.85 cbak_SharebasedCompensationZeroTwoSixEightNineThreeOneSevenNineNineEightXDBTDlmxGNine
Share-based Compensation 7 | $ 14.05 cbak_SharebasedCompensationZeroTwoSixEightNineThreeOneSevenNinehHGdwJxsSeventEightb
Share-based Compensation 8 | $ 12.30 cbak_SharebasedCompensationZeroTwoSixEightNineThreeOneSevenNinenCgSevenpmOneGXSevenCThree
Share-based Compensation 9 | 32,932 cbak_SharebasedCompensationZeroTwoSixEightNineThreeOneSevenNineGNineTNFourSixNineThreeTwoXqt
Share-based Compensation 10 | 0 cbak_SharebasedCompensationZeroTwoSixEightNineThreeOneSevenNinezyPlFsZrvDxOne
Share-based Compensation 11 | 100,000 cbak_SharebasedCompensationZeroTwoSixEightNineThreeOneSevenNinezdZLThreeTNVRSevenNZ
Share-based Compensation 12 | $ 14.05 cbak_SharebasedCompensationZeroTwoSixEightNineThreeOneSevenNineSNineNFourOneKWPFiveThreeGEight
Share-based Compensation 13 | $ 11,089 cbak_SharebasedCompensationZeroTwoSixEightNineThreeOneSevenNinexJRDEightFTVsrGN
Share-based Compensation 14 | 0 cbak_SharebasedCompensationZeroTwoSixEightNineThreeOneSevenNinekpZerotSixNineHgKWkThree

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