Represents the discount rate of promissory notes convertible to raise additional capital.

No definition available.

Name:	dysl_DebtInstrumentDiscountPercentage
Namespace Prefix:	dysl_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

The stated minimum amount of the debt instrument at time of issuance, which may vary from the carrying amount because of unamortized premium or discount.

+ References

No definition available.

+ Details

Name:	dysl_DebtInstrumentEquityFinancingAmount
Namespace Prefix:	dysl_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Debt instrument redemption value at the end of period.

+ References

No definition available.

+ Details

Name:	dysl_DebtInstrumentRedemptionValue
Namespace Prefix:	dysl_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Details

Name:	dysl_DebtLineItems
Namespace Prefix:	dysl_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

It describes the consolidated fixed charge coverage ratio.

+ References

No definition available.

+ Details

Name:	dysl_DescriptionOfConsolidatedFixedChargeCoverageRatio
Namespace Prefix:	dysl_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

It represents the purchase price of debt which is classified under subordinate.

+ References

No definition available.

+ Details

Name:	dysl_PurchasePriceOfSubordinateDebt
Namespace Prefix:	dysl_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of outstanding long-term debt or borrowing associated with any securities or credit agreement for which there has been a default in principal, interest, sinking fund, or redemption provisions, or any breach of covenant that existed at the end of the period and subsequently has not been cured.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.4-08.(c))

-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 08

-Paragraph c

-Article 4

+ Details

Name:	us-gaap_DebtDefaultLongtermDebtAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The reference rate for the variable rate of the debt instrument, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR.

+ References

No definition available.

+ Details

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

- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 55

-Paragraph 8

-URI http://asc.fasb.org/extlink&oid=34725769&loc=d3e28878-108400

+ Details

Name:	us-gaap_DebtInstrumentFaceAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22(a)(1))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

Name:	us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Maximum contractual interest rate for funds borrowed, under the debt agreement.

+ References

+ Details

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

- Definition

Minimum contractual interest rate for funds borrowed, under the debt agreement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22(a)(2))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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

- Definition

Description of the interest rate as being fixed or variable, and, if variable, identification of the index or rate on which the interest rate is based and the number of points or percentage added to that index or rate to set the rate, and other pertinent information, such as frequency of rate resets.

+ References

+ Details

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

- Definition

Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22(a)(2))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

Name:	us-gaap_DebtInstrumentMaturityDate
Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

Description of the maturity date of the debt instrument including whether the debt matures serially and, if so, a brief description of the serial maturities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22(a)(2))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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

- Definition

Amount of the required periodic payments including both interest and principal payments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 470

-Section 50

-Paragraph 3

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=6479336&loc=d3e64711-112823

+ Details

Name:	us-gaap_DebtInstrumentPeriodicPayment
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of the required periodic payments applied to principal.

+ References

+ Details

Name:	us-gaap_DebtInstrumentPeriodicPaymentPrincipal
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 323

-SubTopic 10

-Section 50

-Paragraph 3

-Subparagraph (a)(1)

-URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33918-111571

+ Details

Name:	us-gaap_EquityMethodInvestmentOwnershipPercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

The cash inflow from the issuance of a long-term debt instrument which can be exchanged for a specified amount of another security, typically the entity's common stock, at the option of the issuer or the holder.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 14

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585

+ Details

Name:	us-gaap_ProceedsFromConvertibleDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Details

Name:	dei_LegalEntityAxis=dysl_BankOneMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	dei_LegalEntityAxis=dysl_BankTwoMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	dei_LegalEntityAxis=dysl_MassachusettsDevelopmentFinanceAgencyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	dei_LegalEntityAxis=dysl_MasschusettsCapitalResourceCorporationMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	dei_LegalEntityAxis=dysl_MiddlesexSavingsBankMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	dei_LegalEntityAxis=dysl_OptometricsCorporationMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	dei_LegalEntityAxis=dysl_TownOfAyerIndustrialDevelopmentFinanceAuthorityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=dysl_NotePurchaseAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=dysl_HilgerCrystalsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=dysl_XcedeTechnologiesIncMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ShortTermDebtTypeAxis=dysl_SantanderBankMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Debt (Details Textual) (USD $)	12 Months Ended	1 Months Ended		12 Months Ended
Debt (Details Textual) (USD $)	Sep. 30, 2014	Jul. 31, 2012	Oct. 31, 2013	Sep. 30, 2013	Sep. 30, 2012	May 01, 2014
Debt [Line Items]
Description Of Consolidated Fixed Charge Coverage Ratio	The Bank Loan Agreement requires Dynasil, at the close of each fiscal quarter, to maintain a Debt Service Coverage ratio, as defined, of at least 1.20 to 1.00 on a trailing four quarter basis.
Debt Instrument, Debt Default, Amount				$ 9,800,000us-gaap_DebtDefaultLongtermDebtAmount
Santander Bank [Member]
Debt [Line Items]
Debt Instrument, Debt Default, Amount				6,800,000
Bank One [Member]
Debt [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	5.58%
Debt Instrument, Periodic Payment, Principal	107,143
Bank Two [Member]
Debt [Line Items]
Debt Instrument, Interest Rate Terms	LIBOR plus 3.5%
Debt Instrument, Interest Rate, Stated Percentage				3.68%	3.79%
Debt Instrument, Periodic Payment, Principal	47,619
Masschusetts Capital Resource Corporation [Member]
Debt [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	10.00%
Debt Instrument, Periodic Payment, Principal	25,000
Debt Instrument, Debt Default, Amount				3,000,000
Middlesex Savings Bank [Member]
Debt [Line Items]
Debt Instrument, Face Amount						4,000,000
Debt Instrument, Basis Spread on Variable Rate	3.50%
Debt Instrument, Maturity Date, Description	May, 2017
Debt Instrument, Description of Variable Rate Basis	The interest rate is equal the Prime Rate, but in no event less than 3.25%.
Town of Ayer Industrial Development Finance Authority [Member]
Debt [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	5.00%
Debt Instrument, Maturity Date, Description	The note payable to Ayer will be amortized over ten years with a balloon payment at five years from the date of the note.
Massachusetts Development Finance Agency [Member]
Debt [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	5.25%
Debt Instrument, Maturity Date, Description	March, 2019
Debt Instrument, Periodic Payment	6,000
Optometrics Corporation [Member]
Debt [Line Items]
Debt Instrument, Face Amount	500,000
Debt Instrument, Interest Rate, Stated Percentage Rate Range, Minimum	5.00%
Debt Instrument, Interest Rate, Stated Percentage Rate Range, Maximum	5.25%
Note Purchase Agreement [Member]
Debt [Line Items]
Proceeds from Convertible Debt		3,000,000
Purchase Price Of Subordinate Debt		3,000,000
Debt Instrument, Maturity Date	Jul. 31, 2017
Debt Instrument Redemption Value	130,000
Debt Instrument, Interest Rate, Stated Percentage	10.00%
Hilger Crystals [Member]
Debt [Line Items]
Equity Method Investment, Ownership Percentage	65.00%
Xcede Technologies inc [Member]
Debt [Line Items]
Proceeds from Convertible Debt	1,400,000
Debt Instrument, Maturity Date	Jun. 30, 2015		Jun. 30, 2015
Debt Instrument, Interest Rate, Stated Percentage	5.00%		5.00%
Debt Instrument, Periodic Payment, Principal	3,000,000
Equity Method Investment, Ownership Percentage	90.00%
Debt Instrument Discount Percentage	20.00%		20.00%
Debt Instrument Equity Financing Amount				$ 3,000,000