NATURE OF THE BUSINESS (Details)	12 Months Ended
Sep. 30, 2023 item
NATURE OF THE BUSINESS
Number of primary markets that use the company's technologies	3

Number of primary markets that use the Company's technologies.

No definition available.

Name:	apdn_NumberOfPrimaryMarketsThatUseCompanySTechnologies
Namespace Prefix:	apdn_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration