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Geographical Information (Schedule of Revenue by Geographic Region) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Segment Reporting Information [Line Items]    
Revenue $ 18,416us-gaap_Revenues $ 14,663us-gaap_Revenues
United States    
Segment Reporting Information [Line Items]    
Revenue 13,350us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= country_US		 10,444us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= country_US
Asia    
Segment Reporting Information [Line Items]    
Revenue 2,697us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= exch_XPST		 2,168us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= exch_XPST
Europe    
Segment Reporting Information [Line Items]    
Revenue 2,077us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= us-gaap_EuropeMember		 1,664us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= us-gaap_EuropeMember
Other    
Segment Reporting Information [Line Items]    
Revenue $ 292us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= emkr_OtherGeographicRegionMember		 $ 387us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= emkr_OtherGeographicRegionMember