WARRANTS (Details)	3 Months Ended
Dec. 31, 2023 $ / shares shares
Number of Shares
Balance at October 1, 2023 \| shares	5,220,588
Exercised \| shares	(3,000)
Cancelled or expired \| shares	(4,375)
Balance at December 31, 2023 \| shares	5,213,213
Weighted Average Exercise Price Per Share
Balance at October 1, 2023 \| $ / shares	$ 3.68
Exercised \| $ / shares	5.60
Cancelled or expired \| $ / shares	2.82
Balance at December 31, 2023 \| $ / shares	$ 3.32

This represents the number of warrants exercised by participants.

No definition available.

Name:	apdn_ClassOfWarrantOrRightExercised
Namespace Prefix:	apdn_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

Number of warrants that were either cancelled or expired.

No definition available.

Name:	apdn_ClassOfWarrantOrRightForfeituresAndExpirations
Namespace Prefix:	apdn_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

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

No definition available.

Name:	apdn_ClassOfWarrantOrRightNumberOfSharesRollForward
Namespace Prefix:	apdn_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

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

No definition available.

Name:	apdn_ClassOfWarrantOrRightWeightedAveragePricePerShareRollForward
Namespace Prefix:	apdn_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Per share amount of weighted average exercise price per share or per unit of warrants or rights cancelled or expired.

No definition available.

Name:	apdn_WeightedAveragePricePerShareWarrantCancelledOrExpired
Namespace Prefix:	apdn_
Data Type:	dtr-types:perShareItemType
Balance Type:	na
Period Type:	duration

Per share amount of weighted average exercise price per share or per unit of warrants or rights exercised.

No definition available.

Name:	apdn_WeightedAveragePricePerShareWarrantExercised
Namespace Prefix:	apdn_
Data Type:	dtr-types:perShareItemType
Balance Type:	na
Period Type:	duration

Per share amount of weighted average exercise price per share or per unit of warrants or rights outstanding.

No definition available.

Name:	apdn_WeightedAveragePricePerShareWarrantOutstanding
Namespace Prefix:	apdn_
Data Type:	dtr-types:perShareItemType
Balance Type:	na
Period Type:	instant

Number of warrants or rights outstanding.

No definition available.

Name:	us-gaap_ClassOfWarrantOrRightOutstanding
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant