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Fair Value of the Purchaser and Non-Purchaser Warrants at Issuance (Details) (USD $)
 6 Months Ended 12 Months Ended
Mar. 31, 2015
Sep. 30, 2014
Non-interest Bearing Liabilities Fair Value Of The Purchaser And Non-purchaser Warrants At Issuance 1 1.56%avxl_FairValueOfThePurchaserAndNonpurchaserWarrantsAtIssuanceZeroTwoEightOneOneZeroTwoyEightHgrTWcGEightM  
Non-interest Bearing Liabilities Fair Value Of The Purchaser And Non-purchaser Warrants At Issuance 2 5.00avxl_FairValueOfThePurchaserAndNonpurchaserWarrantsAtIssuanceZeroTwoEightOneOneZeroWZbbQRGVNineRMR  
Non-interest Bearing Liabilities Fair Value Of The Purchaser And Non-purchaser Warrants At Issuance 3 97.16%avxl_FairValueOfThePurchaserAndNonpurchaserWarrantsAtIssuanceZeroTwoEightOneOneZeroJLzCTwoZeroSNineRTtz  
Non-interest Bearing Liabilities Fair Value Of The Purchaser And Non-purchaser Warrants At Issuance 4 0.00%avxl_FairValueOfThePurchaserAndNonpurchaserWarrantsAtIssuanceZeroTwoEightOneOneZeroRgBTQThreemNRxFourk  
Amendment Agreements [Member]    
Non-interest Bearing Liabilities Fair Value Of The Purchaser And Non-purchaser Warrants At Issuance 1   3.13%avxl_FairValueOfThePurchaserAndNonpurchaserWarrantsAtIssuanceZeroTwoSixFourOneThreeOneTwoThreezGSixQbqThreeSixdDlB
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Non-interest Bearing Liabilities Fair Value Of The Purchaser And Non-purchaser Warrants At Issuance 2   29.58avxl_FairValueOfThePurchaserAndNonpurchaserWarrantsAtIssuanceZeroTwoSixFourOneThreeOneTwoThreeSixgTPXFmcmEightwy
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Non-interest Bearing Liabilities Fair Value Of The Purchaser And Non-purchaser Warrants At Issuance 3   100.71%avxl_FairValueOfThePurchaserAndNonpurchaserWarrantsAtIssuanceZeroTwoSixFourOneThreeOneTwoThreekWCgOnedxrggEightw
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Non-interest Bearing Liabilities Fair Value Of The Purchaser And Non-purchaser Warrants At Issuance 4   0.00%avxl_FairValueOfThePurchaserAndNonpurchaserWarrantsAtIssuanceZeroTwoSixFourOneThreeOneTwoThreeNCCfWThreeQqXSevenhl
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Non-interest Bearing Liabilities Fair Value Of The Purchaser And Non-purchaser Warrants At Issuance 1 3.13%avxl_FairValueOfThePurchaserAndNonpurchaserWarrantsAtIssuanceZeroTwoEightOneOneZeroTwoPZMsFCssTSNine
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Non-interest Bearing Liabilities Fair Value Of The Purchaser And Non-purchaser Warrants At Issuance 2 29.58avxl_FairValueOfThePurchaserAndNonpurchaserWarrantsAtIssuanceZeroTwoEightOneOneZeroZOneBHJZXbSixDym
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Non-interest Bearing Liabilities Fair Value Of The Purchaser And Non-purchaser Warrants At Issuance 3 100.71%avxl_FairValueOfThePurchaserAndNonpurchaserWarrantsAtIssuanceZeroTwoEightOneOneZeroSevenSbVXsqSevenTSevennt
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Non-interest Bearing Liabilities Fair Value Of The Purchaser And Non-purchaser Warrants At Issuance 4 0.00%avxl_FairValueOfThePurchaserAndNonpurchaserWarrantsAtIssuanceZeroTwoEightOneOneZeroWmNFourSixSevenbHyrEightN
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Embedded conversion options and warrants [Member]    
Non-interest Bearing Liabilities Fair Value Of The Purchaser And Non-purchaser Warrants At Issuance 1   3.21%avxl_FairValueOfThePurchaserAndNonpurchaserWarrantsAtIssuanceZeroTwoSixFourOneThreeOneTwoThreeyFhBQFNineKfSevenJh
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Non-interest Bearing Liabilities Fair Value Of The Purchaser And Non-purchaser Warrants At Issuance 2   0.10%avxl_FairValueOfThePurchaserAndNonpurchaserWarrantsAtIssuanceZeroTwoSixFourOneThreeOneTwoThreePsflKQPREightbEightFour
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Non-interest Bearing Liabilities Fair Value Of The Purchaser And Non-purchaser Warrants At Issuance 3   29.48avxl_FairValueOfThePurchaserAndNonpurchaserWarrantsAtIssuanceZeroTwoSixFourOneThreeOneTwoThreeHSixFourFourZPGdsLNineg
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Non-interest Bearing Liabilities Fair Value Of The Purchaser And Non-purchaser Warrants At Issuance 4   1.25avxl_FairValueOfThePurchaserAndNonpurchaserWarrantsAtIssuanceZeroTwoSixFourOneThreeOneTwoThreefNLkwgnSSFHNine
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Non-interest Bearing Liabilities Fair Value Of The Purchaser And Non-purchaser Warrants At Issuance 5   100.07%avxl_FairValueOfThePurchaserAndNonpurchaserWarrantsAtIssuanceZeroTwoSixFourOneThreeOneTwoThreeKZZeroOneWFourSCgFZP
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Non-interest Bearing Liabilities Fair Value Of The Purchaser And Non-purchaser Warrants At Issuance 6   77.51%avxl_FairValueOfThePurchaserAndNonpurchaserWarrantsAtIssuanceZeroTwoSixFourOneThreeOneTwoThreesLThreeSWmTBTwoWSevenQ
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Non-interest Bearing Liabilities Fair Value Of The Purchaser And Non-purchaser Warrants At Issuance 7   0.184avxl_FairValueOfThePurchaserAndNonpurchaserWarrantsAtIssuanceZeroTwoSixFourOneThreeOneTwoThreeFourTwogTTPtNinerrqThree
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Non-interest Bearing Liabilities Fair Value Of The Purchaser And Non-purchaser Warrants At Issuance 8   0.65avxl_FairValueOfThePurchaserAndNonpurchaserWarrantsAtIssuanceZeroTwoSixFourOneThreeOneTwoThreeHHKWqzLwrXhD
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Non-interest Bearing Liabilities Fair Value Of The Purchaser And Non-purchaser Warrants At Issuance 9   0.00%avxl_FairValueOfThePurchaserAndNonpurchaserWarrantsAtIssuanceZeroTwoSixFourOneThreeOneTwoThreeJTwBlzKzCSpd
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Non-interest Bearing Liabilities Fair Value Of The Purchaser And Non-purchaser Warrants At Issuance 10   0.00%avxl_FairValueOfThePurchaserAndNonpurchaserWarrantsAtIssuanceZeroTwoSixFourOneThreeOneTwoThreegKVSixXTOnefkqvP
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Non-interest Bearing Liabilities Fair Value Of The Purchaser And Non-purchaser Warrants At Issuance 1 30avxl_FairValueOfThePurchaserAndNonpurchaserWarrantsAtIssuanceZeroTwoEightOneOneZeroCSfBFourDBhTsVK
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Non-interest Bearing Liabilities Fair Value Of The Purchaser And Non-purchaser Warrants At Issuance 2 1.47%avxl_FairValueOfThePurchaserAndNonpurchaserWarrantsAtIssuanceZeroTwoEightOneOneZeroqmTTwoxhyySixFiveEightZero
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Non-interest Bearing Liabilities Fair Value Of The Purchaser And Non-purchaser Warrants At Issuance 3 3.21%avxl_FairValueOfThePurchaserAndNonpurchaserWarrantsAtIssuanceZeroTwoEightOneOneZeroOneOneNineOnesCOnedqyDh
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Non-interest Bearing Liabilities Fair Value Of The Purchaser And Non-purchaser Warrants At Issuance 4 24.19avxl_FairValueOfThePurchaserAndNonpurchaserWarrantsAtIssuanceZeroTwoEightOneOneZeroSixNineFbqEightNineTrFKF
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Non-interest Bearing Liabilities Fair Value Of The Purchaser And Non-purchaser Warrants At Issuance 5 29.48avxl_FairValueOfThePurchaserAndNonpurchaserWarrantsAtIssuanceZeroTwoEightOneOneZeroLnTyPpmwNineFNT
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Non-interest Bearing Liabilities Fair Value Of The Purchaser And Non-purchaser Warrants At Issuance 6 102.14%avxl_FairValueOfThePurchaserAndNonpurchaserWarrantsAtIssuanceZeroTwoEightOneOneZeronTWwMlTFiveKNinePr
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Non-interest Bearing Liabilities Fair Value Of The Purchaser And Non-purchaser Warrants At Issuance 7 100.07%avxl_FairValueOfThePurchaserAndNonpurchaserWarrantsAtIssuanceZeroTwoEightOneOneZeromHpTlNineGFDZeroSK
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Non-interest Bearing Liabilities Fair Value Of The Purchaser And Non-purchaser Warrants At Issuance 8 0.00%avxl_FairValueOfThePurchaserAndNonpurchaserWarrantsAtIssuanceZeroTwoEightOneOneZerobhmsqSWzdqFivet
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Non-interest Bearing Liabilities Fair Value Of The Purchaser And Non-purchaser Warrants At Issuance 9 0.00%avxl_FairValueOfThePurchaserAndNonpurchaserWarrantsAtIssuanceZeroTwoEightOneOneZeroWnwQSwtgwTtEight
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