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Supplemental Cash Flow Information (Narrative) (Details) (USD $)	6 Months Ended
	Mar. 31, 2015
Supplemental Cash Flow Information 1	15,673,912avxl_SupplementalCashFlowInformationZeroTwoEightOneOneZeroZFourryKNineGpSevenVVX
Supplemental Cash Flow Information 2	$ 0.25avxl_SupplementalCashFlowInformationZeroTwoEightOneOneZeroTpTyFiveSixNTwNFiveG
Supplemental Cash Flow Information 3	$ 3,931,000avxl_SupplementalCashFlowInformationZeroTwoEightOneOneZeroSrOnerGZeroMZerofpwS
Supplemental Cash Flow Information 4	$ 221,000avxl_SupplementalCashFlowInformationZeroTwoEightOneOneZeroHxfOneRPNfSixdsb

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