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Derivative Liabilities Activity (Details) (USD $) | 6 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2014 | Sep. 30, 2013
Derivative Liabilities Derivative Liabilities Activity 1 |  | $ 0
Derivative Liabilities Derivative Liabilities Activity 2 |  | 67,500
Derivative Liabilities Derivative Liabilities Activity 3 |  | 919,000
Derivative Liabilities Derivative Liabilities Activity 4 |  | 0
Derivative Liabilities Derivative Liabilities Activity 5 |  | (15,000)
Derivative Liabilities Derivative Liabilities Activity 6 |  | (67,500)
Derivative Liabilities Derivative Liabilities Activity 7 |  | 904,000
Derivative Liabilities Derivative Liabilities Activity 8 |  | 0
Derivative Liabilities Derivative Liabilities Activity 1 | 904,000 |
Derivative Liabilities Derivative Liabilities Activity 2 | 0 |
Derivative Liabilities Derivative Liabilities Activity 3 | 0 |
Derivative Liabilities Derivative Liabilities Activity 4 | 919,000 |
Derivative Liabilities Derivative Liabilities Activity 5 | (683,000) |
Derivative Liabilities Derivative Liabilities Activity 6 | (15,000) |
Derivative Liabilities Derivative Liabilities Activity 7 | (221,000) |
Derivative Liabilities Derivative Liabilities Activity 8 | 0 |
Derivative Liabilities Derivative Liabilities Activity 9 | 0 |
Derivative Liabilities Derivative Liabilities Activity 10 | $ 904,000 |

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- Definition Derivative Liabilities Derivative Liabilities Activity 7 + 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 Derivative Liabilities Derivative Liabilities Activity 3 + 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 Derivative Liabilities Derivative Liabilities Activity 5 + 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 Derivative Liabilities Derivative Liabilities Activity 4 + References No definition available. + Details
Name: | avxl_DerivativeLiabilitiesActivityZeroOneNineFourZeroZeroNQqBtgtWrKxP
Namespace Prefix: | avxl_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | duration

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- Definition Derivative Liabilities Derivative Liabilities Activity 8 + 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 Derivative Liabilities Derivative Liabilities Activity 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 Derivative Liabilities Derivative Liabilities Activity 2 + 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 Derivative Liabilities Derivative Liabilities Activity 6 + 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 Derivative Liabilities Derivative Liabilities Activity 6 + 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 Derivative Liabilities Derivative Liabilities Activity 7 + 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 Derivative Liabilities Derivative Liabilities Activity 9 + 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 Derivative Liabilities Derivative Liabilities Activity 10 + 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 Derivative Liabilities Derivative Liabilities Activity 3 + 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 Derivative Liabilities Derivative Liabilities Activity 4 + 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 Derivative Liabilities Derivative Liabilities Activity 2 + 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 Derivative Liabilities Derivative Liabilities Activity 1 + References No definition available. + Details
Name: | avxl_DerivativeLiabilitiesActivityZeroTwoTwoZeroTwoTwoSixFiveSixwQqmwlFourPNwXm
Namespace Prefix: | avxl_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | duration

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- Definition Derivative Liabilities Derivative Liabilities Activity 5 + References No definition available. + Details
Name: | avxl_DerivativeLiabilitiesActivityZeroTwoTwoZeroTwoTwoSixFiveSixwSCNineXVdOneZThreeCz
Namespace Prefix: | avxl_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | duration

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- Definition Derivative Liabilities Derivative Liabilities Activity 8 + References No definition available. + Details
Name: | avxl_DerivativeLiabilitiesActivityZeroTwoTwoZeroTwoTwoSixFiveSixyJtRCSixGXhFdB
Namespace Prefix: | avxl_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | duration