Stockholders' Equity (Details Textual) (USD $)	1 Months Ended	12 Months Ended								12 Months Ended		1 Months Ended
	Feb. 29, 2012	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2010	Jun. 07, 2012	Apr. 02, 2012	Jul. 05, 2008	Sep. 30, 2012 Employee Stock Plan [Member]	Sep. 30, 2011 Employee Stock Plan [Member]	Sep. 30, 2012 Common Stock [Member]	Sep. 30, 2011 Common Stock [Member]	Dec. 21, 2010 Series C Preferred Stock [Member]	Jul. 31, 2008 Series C Preferred Stock [Member]	Jul. 05, 2008 Series C Preferred Stock [Member]	Jul. 05, 2008 Private Placement [Member] Series B Preferred Stock [Member]
Shares, Issued														5,256,000	5,256,000
Share Price														$ 1.00
Payments of Stock Issuance Costs													$ 0
Preferred Stock, Dividend Rate, Percentage													10.00%
Common Stock, Conversion Basis												On December 21, 2010, Dynasil converted all these shares into its common stock, $0.0005 par value per share at a conversion price of $2.50 per share in a mandatory conversion.	On December 21, 2010, Dynasil converted all these shares into its common stock, $0.0005 par value per share at a conversion price of $2.50 per share in a mandatory conversion
Conversion of Stock, Shares Issued		256,236	208,796									2,102,400
Common stock, shares issued		15,610,517	15,393,053					47,440	28,758
Common Stock, Value, Issued		7,805	7,696					63,122	95,290
Additional paid in capital		17,037,618	15,896,755	1,999,500
Temporary Equity Increase				2,000,000
Common stock, shares outstanding		14,800,357	14,582,893		71,227
Temporary Equity, Par Value						142,454
Stock Issued During Period, Shares, Employee Stock Ownership Plan		4,289,436	3,898,719	6,000,000
Shares, Granted		43,960
Share-Based Compensation Arrangement By Share-Based Payment Award, Options, Exercisable, Weighted Average Exercise Price		$ 3.34	$ 2.73
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period		(395,101)
Common Stock, Capital Shares Reserved for Future Issuance		450,000
Common stock, value		7,805	7,696					63,122	95,290
Sale of Stock, Price Per Share														$ 2.50
Convertible Preferred Stock, Shares Issued upon Conversion							0.40
Preferred stock, shares issued		0	0											122,308
Conversion of Stock, Shares Converted												5,256,000
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized		301,000
Employee Stock Ownership Plan (ESOP), Terms of Repurchase Obligation				Company adopted an Amended and Restated Employee Stock Purchase Plan. The existing plan was amended to extend the termination date to September 28, 2020. The Employee Stock Purchase Plan permits substantially all employees to purchase common stock at a purchase price of 85% of the fair market value of the shares.
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition		6 months
Stock Repurchased During Period, Shares	928,773	928,773
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value		$ 1.34	$ 1.62
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Total Intrinsic Value		92,710	1,003,886
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number		192,085	131,468
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value		135,684	93,882
Issuance of shares of common stock under stock option plan (in shares)		138,373	532,750							0	20,000
Temporary equity, shares outstanding		0	1,000,000
Redeemable common stock, at redemption value of $2 per share; put option on 0 shares and 1,000,000 issued and outstanding at September 30, 2012 and September 30, 2011, respectively.		0	2,000,000
Temporary Equity, Par or Stated Value Per Share		$ 2
Maximum Shares Issuabe													480,000
Stock compensation expense		935,396	563,443
Minimum Stock Value To Be Purchased Under Plan Per Employee Before Amedment		20,000
Minimum Stock Value To Be Purchased Under Plan Per Employee After Amedment		$ 5,000