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Commitments (Details 1) - Purchase Warrants [Member] - $ / shares	3 Months Ended	12 Months Ended
	Mar. 31, 2018	Sep. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Balance, at beginning	1,609,309	1,809,309
Exercised		(200,000)
Balance, at end	1,609,309	1,609,309
Share based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Outstanding Weighted Average Exercise Price [Roll Forward]
Balance, at beginning	$ 2.66	$ 2.70
Exercised		3.00
Balance, at end	$ 2.66	$ 2.66

X

- Definition

The number of exercised in period made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

+ References

No definition available.

+ Details

Name:	AVXL_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExercisedInPeriod
Namespace Prefix:	AVXL_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Information related to share based compensation arrangement by share based payment award equity instruments other than options outstanding weighted average exercise price.

+ References

No definition available.

+ Details

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Namespace Prefix:	AVXL_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Information related to share based compensation arrangement by share based payment award equity instruments other than options outstanding weighted average exercise price.

+ References

No definition available.

+ Details

Name:	AVXL_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingWeightedAverageExercisePriceRollforward
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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Information related to share based compensation arrangements by share based payment award equity instruments other than options exercised in period weighted average exercise price.

+ References

No definition available.

+ Details

Name:	AVXL_ShareBasedCompensationArrangementsByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExercisedInPeriodWeightedAverageExercisePrice
Namespace Prefix:	AVXL_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(i)-(ii)
-URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901

+ Details

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Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

X

- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

+ Details

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Data Type:	xbrli:stringItemType
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X

- Details

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Namespace Prefix:
Data Type:	na
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Period Type: