Document and Entity Information	9 Months Ended
	Jun. 30, 2011	Aug. 01, 2011
Entity Registrant Name	EMCORE CORPORATION
Entity Central Index Key	0000808326
Document Type	10-Q
Document Period End Date	Jun. 30, 2011
Document Fiscal Period Focus	Q3
Document Fiscal Year Focus	2011
Current Fiscal Year End Date	--09-30
Entity Filer Category	Accelerated Filer
Amendment Flag	false
Entity Common Stock, Shares Outstanding		92,980,269