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Geographical Information (Schedule of Long-lived Assets) (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Sep. 30, 2014
Segment Reporting Information [Line Items]    
Long-lived assets $ 8,555us-gaap_NoncurrentAssets $ 10,528us-gaap_NoncurrentAssets
United States    
Segment Reporting Information [Line Items]    
Long-lived assets 2,911us-gaap_NoncurrentAssets
/ us-gaap_StatementGeographicalAxis
= country_US		 4,997us-gaap_NoncurrentAssets
/ us-gaap_StatementGeographicalAxis
= country_US
International    
Segment Reporting Information [Line Items]    
Long-lived assets $ 5,644us-gaap_NoncurrentAssets
/ us-gaap_StatementGeographicalAxis
= emkr_InternationalMember		 $ 5,531us-gaap_NoncurrentAssets
/ us-gaap_StatementGeographicalAxis
= emkr_InternationalMember