It represents number of major customers in concentration risk.

No definition available.

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- 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

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- 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
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+ Details

Name:	us-gaap_ConcentrationRiskPercentage1
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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
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-SubTopic 10
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-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

- Definition

Amount of the cumulative effect on retained earnings before related income tax effect.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 250
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-URI http://asc.fasb.org/extlink&oid=68078379&loc=d3e122869-111746

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Balance Type:	credit
Period Type:	duration

- Details

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- 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
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Period Type:

- Details

Name:	srt_MajorCustomersAxis=apdn_FiveCustomerMember
Namespace Prefix:
Data Type:	na
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- Details

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SUMMARY OF ACCOUNTING POLICIES (Detail Textuals)	3 Months Ended		9 Months Ended		12 Months Ended
SUMMARY OF ACCOUNTING POLICIES (Detail Textuals)	Jun. 30, 2019 USD ($) Customer	Jun. 30, 2018 Customer	Jun. 30, 2019 USD ($) Customer	Jun. 30, 2018 Customer	Sep. 30, 2018 Customer
Concentration Risk [Line Items]
Cumulative adjustment to opening retained earnings in fiscal 2019 \| $			$ 494,000
Revenue recognized in contract liabilities \| $	$ 385,984		$ 1,037,708
Customer Concentration Risk \| Total Revenue
Concentration Risk [Line Items]
Number of customers	2	5	3	3
Customer Concentration Risk \| Total Revenue \| One customer
Concentration Risk [Line Items]
Concentration risk percentage	55.00%	18.00%	37.00%	26.00%
Customer Concentration Risk \| Total Revenue \| Two customer
Concentration Risk [Line Items]
Concentration risk percentage	12.00%	23.00%	20.00%	17.00%
Customer Concentration Risk \| Total Revenue \| Three customer
Concentration Risk [Line Items]
Concentration risk percentage		15.00%	11.00%	16.00%
Customer Concentration Risk \| Total Revenue \| Four customer
Concentration Risk [Line Items]
Concentration risk percentage		12.00%
Customer Concentration Risk \| Total Revenue \| Five customer
Concentration Risk [Line Items]
Concentration risk percentage		15.00%
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			52.00%
Number of customers			3