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Schedule of Stockholders' Equity Note, Warrants or Rights, Activity (Details) (USD $)
 6 Months Ended 12 Months Ended
Mar. 31, 2015
Sep. 30, 2014
Commitments Schedule Of Stockholders' Equity Note, Warrants Or Rights, Activity 1   $ 4,250,141avxl_ScheduleOfStockholdersaposEquityNoteWarrantsOrRightsActivityZeroTwoSixFourOneThreeOneTwoThreedwBThreeGnLZeroNwzH
Commitments Schedule Of Stockholders' Equity Note, Warrants Or Rights, Activity 2   1.16avxl_ScheduleOfStockholdersaposEquityNoteWarrantsOrRightsActivityZeroTwoSixFourOneThreeOneTwoThreeqsDCmQhkRynB
Commitments Schedule Of Stockholders' Equity Note, Warrants Or Rights, Activity 3   (1,549,628)avxl_ScheduleOfStockholdersaposEquityNoteWarrantsOrRightsActivityZeroTwoSixFourOneThreeOneTwoThreeNtDbbZvJQppn
Commitments Schedule Of Stockholders' Equity Note, Warrants Or Rights, Activity 4   2.56avxl_ScheduleOfStockholdersaposEquityNoteWarrantsOrRightsActivityZeroTwoSixFourOneThreeOneTwoThreeVzThreeQrlFykgdL
Commitments Schedule Of Stockholders' Equity Note, Warrants Or Rights, Activity 5   6,448,966avxl_ScheduleOfStockholdersaposEquityNoteWarrantsOrRightsActivityZeroTwoSixFourOneThreeOneTwoThreelOneWvXFiveZtGNineFiveL
Commitments Schedule Of Stockholders' Equity Note, Warrants Or Rights, Activity 6   0.75avxl_ScheduleOfStockholdersaposEquityNoteWarrantsOrRightsActivityZeroTwoSixFourOneThreeOneTwoThreenNCrbtNinevhHZerop
Commitments Schedule Of Stockholders' Equity Note, Warrants Or Rights, Activity 7   9,149,479avxl_ScheduleOfStockholdersaposEquityNoteWarrantsOrRightsActivityZeroTwoSixFourOneThreeOneTwoThreeWrpmTWdJQfBNine
Commitments Schedule Of Stockholders' Equity Note, Warrants Or Rights, Activity 8   0.75avxl_ScheduleOfStockholdersaposEquityNoteWarrantsOrRightsActivityZeroTwoSixFourOneThreeOneTwoThreetBZerolXwwNineFFiveGC
Commitments Schedule Of Stockholders' Equity Note, Warrants Or Rights, Activity 9   (2,700,513)avxl_ScheduleOfStockholdersaposEquityNoteWarrantsOrRightsActivityZeroTwoSixFourOneThreeOneTwoThreeBhbRgpmSixlcfFive
Commitments Schedule Of Stockholders' Equity Note, Warrants Or Rights, Activity 10   0.75avxl_ScheduleOfStockholdersaposEquityNoteWarrantsOrRightsActivityZeroTwoSixFourOneThreeOneTwoThreeKNineQHByySevenQRNineg
Commitments Schedule Of Stockholders' Equity Note, Warrants Or Rights, Activity 11   68,466,666avxl_ScheduleOfStockholdersaposEquityNoteWarrantsOrRightsActivityZeroTwoSixFourOneThreeOneTwoThreeDSevenCFourgNineTDFiveHxFive
Commitments Schedule Of Stockholders' Equity Note, Warrants Or Rights, Activity 12   0.36avxl_ScheduleOfStockholdersaposEquityNoteWarrantsOrRightsActivityZeroTwoSixFourOneThreeOneTwoThreeMZTKqGHZSevenDNn
Commitments Schedule Of Stockholders' Equity Note, Warrants Or Rights, Activity 13   74,915,632avxl_ScheduleOfStockholdersaposEquityNoteWarrantsOrRightsActivityZeroTwoSixFourOneThreeOneTwoThreefOneTwstSixfksFZero
Commitments Schedule Of Stockholders' Equity Note, Warrants Or Rights, Activity 14   0.40avxl_ScheduleOfStockholdersaposEquityNoteWarrantsOrRightsActivityZeroTwoSixFourOneThreeOneTwoThreeNSixWysrQcxThreeZFive
Commitments Schedule Of Stockholders' Equity Note, Warrants Or Rights, Activity 1 9,149,479avxl_ScheduleOfStockholdersaposEquityNoteWarrantsOrRightsActivityZeroTwoEightOneOneZeroThreeZeroRGcTwoxBQDSevenZero  
Commitments Schedule Of Stockholders' Equity Note, Warrants Or Rights, Activity 2 0.75avxl_ScheduleOfStockholdersaposEquityNoteWarrantsOrRightsActivityZeroTwoEightOneOneZeropKCPxwHTwowmBz  
Commitments Schedule Of Stockholders' Equity Note, Warrants Or Rights, Activity 3 (2,700,513)avxl_ScheduleOfStockholdersaposEquityNoteWarrantsOrRightsActivityZeroTwoEightOneOneZeroTnZLTwoSixOneNHFourNy  
Commitments Schedule Of Stockholders' Equity Note, Warrants Or Rights, Activity 4 0.75avxl_ScheduleOfStockholdersaposEquityNoteWarrantsOrRightsActivityZeroTwoEightOneOneZeroTwoqfgBFournMXLkEight  
Commitments Schedule Of Stockholders' Equity Note, Warrants Or Rights, Activity 5 68,466,666avxl_ScheduleOfStockholdersaposEquityNoteWarrantsOrRightsActivityZeroTwoEightOneOneZeroTOnecMSNinefSvSevenFoury  
Commitments Schedule Of Stockholders' Equity Note, Warrants Or Rights, Activity 6 0.36avxl_ScheduleOfStockholdersaposEquityNoteWarrantsOrRightsActivityZeroTwoEightOneOneZeromqcJMryNineMKTwoB  
Commitments Schedule Of Stockholders' Equity Note, Warrants Or Rights, Activity 7 74,915,632avxl_ScheduleOfStockholdersaposEquityNoteWarrantsOrRightsActivityZeroTwoEightOneOneZeroWHSixxvTBwyTwoMC  
Commitments Schedule Of Stockholders' Equity Note, Warrants Or Rights, Activity 8 0.40avxl_ScheduleOfStockholdersaposEquityNoteWarrantsOrRightsActivityZeroTwoEightOneOneZeroNpqqyNinegFournmGv  
Commitments Schedule Of Stockholders' Equity Note, Warrants Or Rights, Activity 9 (250,000)avxl_ScheduleOfStockholdersaposEquityNoteWarrantsOrRightsActivityZeroTwoEightOneOneZeroSevenQZeroZWSixZMxSevenSL  
Commitments Schedule Of Stockholders' Equity Note, Warrants Or Rights, Activity 10 0.19avxl_ScheduleOfStockholdersaposEquityNoteWarrantsOrRightsActivityZeroTwoEightOneOneZeroNdOneBKlMRbFVt  
Commitments Schedule Of Stockholders' Equity Note, Warrants Or Rights, Activity 11 4,300,000avxl_ScheduleOfStockholdersaposEquityNoteWarrantsOrRightsActivityZeroTwoEightOneOneZeroOneccsBxThreeFNineHrh  
Commitments Schedule Of Stockholders' Equity Note, Warrants Or Rights, Activity 12 0.35avxl_ScheduleOfStockholdersaposEquityNoteWarrantsOrRightsActivityZeroTwoEightOneOneZeroNinelGFourMvRvwFSC  
Commitments Schedule Of Stockholders' Equity Note, Warrants Or Rights, Activity 13 $ 78,965,632avxl_ScheduleOfStockholdersaposEquityNoteWarrantsOrRightsActivityZeroTwoEightOneOneZeroDGSevenThreewZerostFourQgk  
Commitments Schedule Of Stockholders' Equity Note, Warrants Or Rights, Activity 14 0.40avxl_ScheduleOfStockholdersaposEquityNoteWarrantsOrRightsActivityZeroTwoEightOneOneZeroQTwoThreedLCZeroSevenNNmT