INCOME TAXES (Parentheticals) (Details)	12 Months Ended
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:	num:percentItemType
Balance Type:	na
Period Type:	duration