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Description of Business Asset Sales (Details) (USD $)
In Millions, unless otherwise specified
 0 Months Ended
Oct. 22, 2014
Dec. 10, 2014
Photovoltaics Business | Photovoltaics    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Asset purchase agreement, selling price   $ 150.0emkr_DisposalGroupIncludingDiscontinuedOperationConsideration
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= emkr_PhotovoltaicsBusinessMember
/ us-gaap_StatementBusinessSegmentsAxis
= emkr_PhotovoltaicsMember
Digital Products Business    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Asset purchase agreement, selling price 17.5emkr_DisposalGroupIncludingDiscontinuedOperationConsideration
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= emkr_DigitalProductsBusinessMember		  
Asset sale, cash consideration 1.5emkr_DisposalGroupIncludingDiscontinuedOperationConsiderationCash
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= emkr_DigitalProductsBusinessMember		  
Asset sale, promissory note, principal amount $ 16.0emkr_DisposalGroupIncludingDiscontinuedOperationConsiderationNotePrincipalAmount
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= emkr_DigitalProductsBusinessMember