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INCOME TAXES (Details)	12 Months Ended
INCOME TAXES (Details)	Sep. 30, 2020	Sep. 30, 2019
INCOME TAXES
Federal benefit	1.00%	1.00%

Represents percentage effective income tax rate reconciliation federal benefit.

No definition available.

Name:	apdn_EffectiveIncomeTaxRateReconciliationFederalBenefit
Namespace Prefix:	apdn_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

No definition available.

Name:	us-gaap_IncomeTaxDisclosureAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration