Document and Entity Information	6 Months Ended
	Mar. 31, 2012	May 01, 2012
Document and Entity Information [Abstract]
Entity Registrant Name	SURMODICS INC
Entity Central Index Key	0000924717
Document Type	10-Q
Document Period End Date	Mar. 31, 2012
Amendment Flag	false
Document Fiscal Year Focus	2012
Document Fiscal Period Focus	Q2
Current Fiscal Year End Date	--09-30
Entity Filer Category	Accelerated Filer
Entity Common Stock, Shares Outstanding		17,543,188