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