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Income Taxes (Narrative) (Details) (USD $) | 12 Months Ended
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Sep. 30, 2014
Income Taxes 1 | $ 24,000,000avxl_IncomeTaxesZeroTwoSixFourOneThreeOneTwoThreebkLvThreeWkxFfQN
Income Taxes 2 | $ 21,000,000avxl_IncomeTaxesZeroTwoSixFourOneThreeOneTwoThreegTwogGJSixlTxxGM

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- Definition Income Taxes 1 + References No definition available. + Details
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Namespace Prefix: | avxl_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | duration

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- Definition Income Taxes 2 + References No definition available. + Details
Name: | avxl_IncomeTaxesZeroTwoSixFourOneThreeOneTwoThreegTwogGJSixlTxxGM
Namespace Prefix: | avxl_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | duration