Document and Entity Information
3 Months Ended
Dec. 31, 2013
Jan. 31, 2014
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, 2013  
Document Fiscal Period Focus Q1  
Document Fiscal Year Focus 2014  
Current Fiscal Year End Date --09-30  
Entity Filer Category Accelerated Filer  
Amendment Flag false  
Entity Common Stock, Shares Outstanding   30,357,764