Document and Entity Information	3 Months Ended
	Dec. 31, 2011	Feb. 10, 2012
Entity Registrant Name	EMCORE CORPORATION
Entity Central Index Key	0000808326
Document Type	10-Q
Document Period End Date	Dec. 31, 2011
Document Fiscal Period Focus	Q1
Document Fiscal Year Focus	2012
Current Fiscal Year End Date	--09-30
Entity Filer Category	Accelerated Filer
Amendment Flag	false
Entity Common Stock, Shares Outstanding		94,083,764