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Schedule of Share-based Compensation, Stock Options, Activity (Details) (USD $) | 12 Months Ended
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Sep. 30, 2014
Commitments Schedule Of Share-based Compensation, Stock Options, Activity 1 | $ 1,775,000 avxl_ScheduleOfSharebasedCompensationStockOptionsActivityZeroTwoSixFourOneThreeOneTwoThreeZeroZhcZeroZkJMmBOne
Commitments Schedule Of Share-based Compensation, Stock Options, Activity 2 | 2.94 avxl_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 | 3.86 avxl_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 | 3.72 avxl_ScheduleOfSharebasedCompensationStockOptionsActivityZeroTwoSixFourOneThreeOneTwoThreeWEightSixZGKpwyVTX
Commitments Schedule Of Share-based Compensation, Stock Options, Activity 7 | 2,000,000 avxl_ScheduleOfSharebasedCompensationStockOptionsActivityZeroTwoSixFourOneThreeOneTwoThreephFivezZeroTgThreeTJzZero
Commitments Schedule Of Share-based Compensation, Stock Options, Activity 8 | 0.40 avxl_ScheduleOfSharebasedCompensationStockOptionsActivityZeroTwoSixFourOneThreeOneTwoThreebOnegcLJXDZeroTvZero
Commitments Schedule Of Share-based Compensation, Stock Options, Activity 9 | 0.50 avxl_ScheduleOfSharebasedCompensationStockOptionsActivityZeroTwoSixFourOneThreeOneTwoThreeTwTwFKzHPsNinex
Commitments Schedule Of Share-based Compensation, Stock Options, Activity 10 | 3,075,000 avxl_ScheduleOfSharebasedCompensationStockOptionsActivityZeroTwoSixFourOneThreeOneTwoThreeHnFourThreecXpDwqRh
Commitments Schedule Of Share-based Compensation, Stock Options, Activity 11 | 1.26 avxl_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 | 2.70 avxl_ScheduleOfSharebasedCompensationStockOptionsActivityZeroTwoSixFourOneThreeOneTwoThreeBSevenJvTdFivekzsdd
Commitments Schedule Of Share-based Compensation, Stock Options, Activity 14 | 800,000 avxl_ScheduleOfSharebasedCompensationStockOptionsActivityZeroTwoSixFourOneThreeOneTwoThreeJSSixFiveSevenFiveqdNineTyn
Commitments Schedule Of Share-based Compensation, Stock Options, Activity 15 | 0.32 avxl_ScheduleOfSharebasedCompensationStockOptionsActivityZeroTwoSixFourOneThreeOneTwoThreeZPZeroVfQCrRBBg
Commitments Schedule Of Share-based Compensation, Stock Options, Activity 16 | 0.25 avxl_ScheduleOfSharebasedCompensationStockOptionsActivityZeroTwoSixFourOneThreeOneTwoThreeZeroQTSTFlLwrPv
Commitments Schedule Of Share-based Compensation, Stock Options, Activity 17 | 3,170,000 avxl_ScheduleOfSharebasedCompensationStockOptionsActivityZeroTwoSixFourOneThreeOneTwoThreeZerolRFourVMlNinevOnevK
Commitments Schedule Of Share-based Compensation, Stock Options, Activity 18 | 0.70 avxl_ScheduleOfSharebasedCompensationStockOptionsActivityZeroTwoSixFourOneThreeOneTwoThreehRBHFiveZKSevenRSevenOneP
Commitments Schedule Of Share-based Compensation, Stock Options, Activity 19 | 2,100,000 avxl_ScheduleOfSharebasedCompensationStockOptionsActivityZeroTwoSixFourOneThreeOneTwoThreepclryzFourKpCFOne
Commitments Schedule Of Share-based Compensation, Stock Options, Activity 20 | 0.56 avxl_ScheduleOfSharebasedCompensationStockOptionsActivityZeroTwoSixFourOneThreeOneTwoThreeNKVNinerZFiveThreewMFFour
Commitments Schedule Of Share-based Compensation, Stock Options, Activity 21 | $ 2,305,000 avxl_ScheduleOfSharebasedCompensationStockOptionsActivityZeroTwoSixFourOneThreeOneTwoThreexEightDxNinehFNSixhTwoB
Commitments Schedule Of Share-based Compensation, Stock Options, Activity 22 | 0.79 avxl_ScheduleOfSharebasedCompensationStockOptionsActivityZeroTwoSixFourOneThreeOneTwoThreeDJnlWGGyxGTh

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