Document and Entity Information - shares	3 Months Ended
	Dec. 31, 2016	Feb. 01, 2017
Document And Entity Information [Abstract]
Entity Registrant Name	EMCORE CORPORATION
Entity Central Index Key	0000808326
Document Type	10-Q
Document Period End Date	Dec. 31, 2016
Document Fiscal Period Focus	Q1
Document Fiscal Year Focus	2016
Current Fiscal Year End Date	--09-30
Entity Filer Category	Accelerated Filer
Amendment Flag	false
Entity Common Stock, Shares Outstanding		26,584,521