It represents number of major customers in concentration risk.

No definition available.

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

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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

- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 18
-URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6351-108592

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=109250915&loc=d3e13531-108611

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 21
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109250915&loc=d3e13537-108611

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6404-108592

+ Details

Name:	us-gaap_ConcentrationRiskPercentage1
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 8
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130549-203045

+ Details

Name:	us-gaap_ContractWithCustomerLiabilityRevenueRecognized
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Details

Name:	us-gaap_ConcentrationRiskByTypeAxis=us-gaap_CustomerConcentrationRiskMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ConcentrationRiskByBenchmarkAxis=us-gaap_SalesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_MajorCustomersAxis=apdn_OneCustomerMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_MajorCustomersAxis=apdn_TwoCustomerMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_MajorCustomersAxis=apdn_ThreeCustomersMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_MajorCustomersAxis=apdn_FourCustomersMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_MajorCustomersAxis=apdn_FiveCustomerMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ConcentrationRiskByBenchmarkAxis=us-gaap_AccountsReceivableMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

SUMMARY OF ACCOUNTING POLICIES (Detail Textuals)	3 Months Ended		6 Months Ended		12 Months Ended
SUMMARY OF ACCOUNTING POLICIES (Detail Textuals)	Mar. 31, 2019 USD ($) Customer	Mar. 31, 2018 Customer	Mar. 31, 2019 USD ($) Customer	Mar. 31, 2018 Customer	Sep. 30, 2018 Customer
Concentration Risk [Line Items]
Revenue recognized in contract liabilities \| $	$ 407,788		$ 737,323
Customer Concentration Risk \| Total Revenue
Concentration Risk [Line Items]
Number of customers	2	5	4	3
Customer Concentration Risk \| Total Revenue \| One customer
Concentration Risk [Line Items]
Concentration risk percentage	31.00%	10.00%	29.00%	11.00%
Customer Concentration Risk \| Total Revenue \| Two customer
Concentration Risk [Line Items]
Concentration risk percentage	14.00%	12.00%	15.00%	18.00%
Customer Concentration Risk \| Total Revenue \| Three customer
Concentration Risk [Line Items]
Concentration risk percentage		15.00%	14.00%	28.00%
Customer Concentration Risk \| Total Revenue \| Four customer
Concentration Risk [Line Items]
Concentration risk percentage		17.00%	10.00%
Customer Concentration Risk \| Total Revenue \| Five customer
Concentration Risk [Line Items]
Concentration risk percentage		22.00%
Customer Concentration Risk \| Accounts Receivable \| One customer
Concentration Risk [Line Items]
Concentration risk percentage					82.00%
Number of customers					1
Customer Concentration Risk \| Accounts Receivable \| Three customer
Concentration Risk [Line Items]
Concentration risk percentage			70.00%
Number of customers			3