Debt (Details Textual) (USD $)	1 Months Ended	12 Months Ended					12 Months Ended		12 Months Ended		1 Months Ended	12 Months Ended		1 Months Ended	12 Months Ended
	Feb. 29, 2012	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012 Term Loan [Member]	Sep. 30, 2012 Working Capital Line Of Credit [Member]	Sep. 30, 2011 Working Capital Line Of Credit [Member]	Sep. 30, 2012 Acquisition Line Of Credit [Member]	Sep. 30, 2011 Acquisition Line Of Credit [Member]	Sep. 30, 2012 Acquisition Line Of Credit [Member] Hilger Crystals [Member]	Jul. 31, 2010 Acquisition Line Of Credit [Member] Hilger Crystals [Member]	Jul. 31, 2012 Entine Promissory Notes [Member]	Sep. 30, 2012 Entine Promissory Notes [Member]	Jun. 07, 2012 Entine Promissory Notes [Member]	Jul. 31, 2012 Note Purchase Agreement [Member]	Sep. 30, 2012 Note Purchase Agreement [Member]
Stock Repurchased During Period, Shares	928,773	928,773
Notes Payable													$ 1,857,546
Proceeds from issuance of common stock		63,122	135,302									2,000,000
Proceeds from Convertible Debt														3,000,000
Purchase Price Of Subordinate Debt														3,000,000
Debt Instrument, Maturity Date				Jul. 07, 2015			Jul. 07, 2015		Jul. 07, 2015						Jul. 31, 2017
Debt Instrument Redemption Value															130,434
Repayments of Notes Payable											1,857,546
Description Of Consolidated Maximum Leverage Ratio		For the Consolidated Maximum Leverage Ratio (Consolidated Total Funded Debt to Consolidated EBITDA, as defined in the Amendment), the Amendment (i) revised the required ratio for September 30, 2012 from 3.25x to 4.5x; (ii) revised the required ratio for The Amendment also includes a new Consolidated Maximum Adjusted Leverage Ratio covenant, which is Consolidated Total Funded Debt (excluding subordinated debt) to Consolidated EBITDA, as defined in the Amendment. The Amendment requires the December 31, 2012 from 3.00x to 4.5x; and (iii) revised the required ratio for March 31, 2013 and for each rolling four quarters thereafter from 3.00x to 4.0x.
Description Of Consolidated Fixed Charge Coverage Ratio		For the Consolidated Fixed Charge Coverage Ratio, the Amendment (i) revised the required ratio for September 30, 2012 from 1.10x to 1.00x; (ii) revised the required ratio for December 31, 2012 from 1.20x to 1.00x; (iii) revised the required ratio for March 31, 2013 from 1.20x to 1.05x; (iv) revised the required ratio at 6/30/13 from 1.20x to 1.10x; and (v) did not change the required ratio at September 30, 2013 (remained at 1.20x).
Interest and Debt Expense		75,000
Debt Instrument, Interest Rate Terms					Interest rate of Prime or one month LIBOR plus 2.75		A monthly fee calculated at the rate of 0.25% per annum of the unused Acquisition Line of Credit
Line of Credit Facility, Maximum Borrowing Capacity				9,000,000	3,000,000		5,000,000
Credit Facility Term				5 Years			7 Years
Debt Instrument, Interest Rate, Stated Percentage				5.58%									10.00%		10.00%
Debt Instrument, Frequency of Periodic Payment				Monthly
Debt Instrument, Fee					A monthly fee calculated at the rate of 0.25% per annum of the unused Working Capital Line of Credit
Line of Credit Facility, Remaining Borrowing Capacity					0	3,000,000	0	1,000,000
Business Acquisition, Purchase Price Allocation, Notes Payable and Long-term Debt										4,000,000
Debt Instrument, Periodic Payment, Principal									47,619.00
Obligation Under Bank Loan Agreement		Dynasil's obligations under the Bank Loan Agreement are guaranteed by EMF, Optometrics, Dynasil Products, RMD Research and Dynasil and each of such subsidiaries have granted the bank a security interest in substantially all its personal property.  In addition, EMF has granted a mortgage in the Bank's favor as to EMF's leasehold property in Ithaca, New York and 65% of the outstanding shares of Hilger are pledged as collateral to the Bank. The Bank Loan Agreement also requires maintenance of certain financial and nonfinancial covenants.
Debt Instrument, Covenant Description		The Amendment requires the Company to maintain a Consolidated Maximum Adjusted Leverage Ratio equal to or less than (i) 3.25x to 1.00x for each of the rolling four quarter periods ending on September 30, 2012 and December 31, 2012, and (ii) 3.00x to 1.00x for each rolling four quarter period ending on or after March 31, 2013.
Debt Instrument, Face Amount		$ 107,142,850