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Schedule of Share-based Compensation, Stock Options, Activity (Details) (USD $) | 6 Months Ended | 12 Months Ended
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Mar. 31, 2015 | Sep. 30, 2014
Commitments Schedule Of Share-based Compensation, Stock Options, Activity 1 |  | $ 1,775,000avxl_ScheduleOfSharebasedCompensationStockOptionsActivityZeroTwoSixFourOneThreeOneTwoThreeZeroZhcZeroZkJMmBOne
Commitments Schedule Of Share-based Compensation, Stock Options, Activity 2 |  | 2.94avxl_ScheduleOfSharebasedCompensationStockOptionsActivityZeroTwoSixFourOneThreeOneTwoThreeDLFivetJSixHWPGRR
Commitments Schedule Of Share-based Compensation, Stock Options, Activity 3 |  | (550,000)avxl_ScheduleOfSharebasedCompensationStockOptionsActivityZeroTwoSixFourOneThreeOneTwoThreeFTwoGlvThreefwTwofwn
Commitments Schedule Of Share-based Compensation, Stock Options, Activity 4 |  | 3.86avxl_ScheduleOfSharebasedCompensationStockOptionsActivityZeroTwoSixFourOneThreeOneTwoThreeTPDFThreeLSThreekdLSeven
Commitments Schedule Of Share-based Compensation, Stock Options, Activity 5 |  | (150,000)avxl_ScheduleOfSharebasedCompensationStockOptionsActivityZeroTwoSixFourOneThreeOneTwoThreeLNThreeNinendMzMJTr
Commitments Schedule Of Share-based Compensation, Stock Options, Activity 6 |  | 3.72avxl_ScheduleOfSharebasedCompensationStockOptionsActivityZeroTwoSixFourOneThreeOneTwoThreeWEightSixZGKpwyVTX
Commitments Schedule Of Share-based Compensation, Stock Options, Activity 7 |  | 2,000,000avxl_ScheduleOfSharebasedCompensationStockOptionsActivityZeroTwoSixFourOneThreeOneTwoThreephFivezZeroTgThreeTJzZero
Commitments Schedule Of Share-based Compensation, Stock Options, Activity 8 |  | 0.40avxl_ScheduleOfSharebasedCompensationStockOptionsActivityZeroTwoSixFourOneThreeOneTwoThreebOnegcLJXDZeroTvZero
Commitments Schedule Of Share-based Compensation, Stock Options, Activity 9 |  | 0.50avxl_ScheduleOfSharebasedCompensationStockOptionsActivityZeroTwoSixFourOneThreeOneTwoThreeTwTwFKzHPsNinex
Commitments Schedule Of Share-based Compensation, Stock Options, Activity 10 |  | 3,075,000avxl_ScheduleOfSharebasedCompensationStockOptionsActivityZeroTwoSixFourOneThreeOneTwoThreeHnFourThreecXpDwqRh
Commitments Schedule Of Share-based Compensation, Stock Options, Activity 11 |  | 1.26avxl_ScheduleOfSharebasedCompensationStockOptionsActivityZeroTwoSixFourOneThreeOneTwoThreeThreeSSevenbnEightQrSGmS
Commitments Schedule Of Share-based Compensation, Stock Options, Activity 12 |  | (705,000)avxl_ScheduleOfSharebasedCompensationStockOptionsActivityZeroTwoSixFourOneThreeOneTwoThreeThreezkThreefNineBDQXZP
Commitments Schedule Of Share-based Compensation, Stock Options, Activity 13 |  | 2.70avxl_ScheduleOfSharebasedCompensationStockOptionsActivityZeroTwoSixFourOneThreeOneTwoThreeBSevenJvTdFivekzsdd
Commitments Schedule Of Share-based Compensation, Stock Options, Activity 14 |  | 800,000avxl_ScheduleOfSharebasedCompensationStockOptionsActivityZeroTwoSixFourOneThreeOneTwoThreeJSSixFiveSevenFiveqdNineTyn
Commitments Schedule Of Share-based Compensation, Stock Options, Activity 15 |  | 0.32avxl_ScheduleOfSharebasedCompensationStockOptionsActivityZeroTwoSixFourOneThreeOneTwoThreeZPZeroVfQCrRBBg
Commitments Schedule Of Share-based Compensation, Stock Options, Activity 16 |  | 0.25avxl_ScheduleOfSharebasedCompensationStockOptionsActivityZeroTwoSixFourOneThreeOneTwoThreeZeroQTSTFlLwrPv
Commitments Schedule Of Share-based Compensation, Stock Options, Activity 17 |  | 3,170,000avxl_ScheduleOfSharebasedCompensationStockOptionsActivityZeroTwoSixFourOneThreeOneTwoThreeZerolRFourVMlNinevOnevK
Commitments Schedule Of Share-based Compensation, Stock Options, Activity 18 |  | 0.70avxl_ScheduleOfSharebasedCompensationStockOptionsActivityZeroTwoSixFourOneThreeOneTwoThreehRBHFiveZKSevenRSevenOneP
Commitments Schedule Of Share-based Compensation, Stock Options, Activity 19 |  | 2,100,000avxl_ScheduleOfSharebasedCompensationStockOptionsActivityZeroTwoSixFourOneThreeOneTwoThreepclryzFourKpCFOne
Commitments Schedule Of Share-based Compensation, Stock Options, Activity 20 |  | 0.56avxl_ScheduleOfSharebasedCompensationStockOptionsActivityZeroTwoSixFourOneThreeOneTwoThreeNKVNinerZFiveThreewMFFour
Commitments Schedule Of Share-based Compensation, Stock Options, Activity 21 |  | 2,305,000avxl_ScheduleOfSharebasedCompensationStockOptionsActivityZeroTwoSixFourOneThreeOneTwoThreexEightDxNinehFNSixhTwoB
Commitments Schedule Of Share-based Compensation, Stock Options, Activity 22 |  | 0.79avxl_ScheduleOfSharebasedCompensationStockOptionsActivityZeroTwoSixFourOneThreeOneTwoThreeDJnlWGGyxGTh
Commitments Schedule Of Share-based Compensation, Stock Options, Activity 1 | 3,075,000avxl_ScheduleOfSharebasedCompensationStockOptionsActivityZeroTwoEightOneOneZeroHJfKRJkyRpTq |
Commitments Schedule Of Share-based Compensation, Stock Options, Activity 2 | 1.26avxl_ScheduleOfSharebasedCompensationStockOptionsActivityZeroTwoEightOneOneZerolkwrFourdKJFiveBEightJ |
Commitments Schedule Of Share-based Compensation, Stock Options, Activity 3 | (705,000)avxl_ScheduleOfSharebasedCompensationStockOptionsActivityZeroTwoEightOneOneZeromSLGLgKPtZerofn |
Commitments Schedule Of Share-based Compensation, Stock Options, Activity 4 | 2.70avxl_ScheduleOfSharebasedCompensationStockOptionsActivityZeroTwoEightOneOneZeroFVgLTwoXxkVDwQ |
Commitments Schedule Of Share-based Compensation, Stock Options, Activity 5 | 800,000avxl_ScheduleOfSharebasedCompensationStockOptionsActivityZeroTwoEightOneOneZeroWMThreeKQJzZEightHZeroB |
Commitments Schedule Of Share-based Compensation, Stock Options, Activity 6 | 0.32avxl_ScheduleOfSharebasedCompensationStockOptionsActivityZeroTwoEightOneOneZeroFStnZXTWnDZw |
Commitments Schedule Of Share-based Compensation, Stock Options, Activity 7 | 0.25avxl_ScheduleOfSharebasedCompensationStockOptionsActivityZeroTwoEightOneOneZeronBttwrfThreefqxq |
Commitments Schedule Of Share-based Compensation, Stock Options, Activity 8 | 3,170,000avxl_ScheduleOfSharebasedCompensationStockOptionsActivityZeroTwoEightOneOneZeroNinecVzvSPJRTFourR |
Commitments Schedule Of Share-based Compensation, Stock Options, Activity 9 | 0.70avxl_ScheduleOfSharebasedCompensationStockOptionsActivityZeroTwoEightOneOneZeroNinenfbNJXzdzly |
Commitments Schedule Of Share-based Compensation, Stock Options, Activity 10 | 2,100,000avxl_ScheduleOfSharebasedCompensationStockOptionsActivityZeroTwoEightOneOneZeroGBQMROneSnHppv |
Commitments Schedule Of Share-based Compensation, Stock Options, Activity 11 | 0.56avxl_ScheduleOfSharebasedCompensationStockOptionsActivityZeroTwoEightOneOneZeroGBCSMRydTywS |
Commitments Schedule Of Share-based Compensation, Stock Options, Activity 12 | $ 2,100,000avxl_ScheduleOfSharebasedCompensationStockOptionsActivityZeroTwoEightOneOneZeroKQdFHdJGmBCX |
Commitments Schedule Of Share-based Compensation, Stock Options, Activity 13 | 0.56avxl_ScheduleOfSharebasedCompensationStockOptionsActivityZeroTwoEightOneOneZeroxVVSixqgThreeFouryFRy |

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