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Discontinued Operations (Details) (USD $)
12 Months Ended 3 Months Ended
Dec. 27, 2014
Dec. 28, 2013
Dec. 29, 2012
Mar. 30, 2013
Jan. 16, 2013
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Business Acquisition, Cost of Acquired Entity, Purchase Price         $ 70,200,000kopn_DisposalGroupIncludingDiscontinuedOperationAggregatePurchasePriceNetofAdjustments
Accounts and Notes Receivable, Net 14,933,335us-gaap_AccountsAndNotesReceivableNet 14,866,666us-gaap_AccountsAndNotesReceivableNet     14,800,000us-gaap_AccountsAndNotesReceivableNet
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract]          
Income from discontinued operations, net of tax 0us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax 20,147,532us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax 2,789,048us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax    
III-V product line including all outstanding equity interest in KTC Wireless, LLC          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Aggregate purchase price         75,000,000kopn_DisposalGroupIncludingDiscontinuedOperationAggregatePurchasePrice
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= kopn_IiiVProductLineIncludingAllOutstandingEquityInterestInKtcWirelessLlcMember
Proceeds received from divestiture       55,200,000us-gaap_ProceedsFromDivestitureOfBusinesses
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= kopn_IiiVProductLineIncludingAllOutstandingEquityInterestInKtcWirelessLlcMember
 
Consideration to be paid on the third anniversary of the Closing Date         15,000,000kopn_DisposalGroupIncludingDiscontinuedOperationFutureConsiderationReceivable
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= kopn_IiiVProductLineIncludingAllOutstandingEquityInterestInKtcWirelessLlcMember
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract]          
Net sales and other operating revenues   2,300,000us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= kopn_IiiVProductLineIncludingAllOutstandingEquityInterestInKtcWirelessLlcMember
58,800,000us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= kopn_IiiVProductLineIncludingAllOutstandingEquityInterestInKtcWirelessLlcMember
   
Income from operations before income taxes   (200,000)us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodBeforeIncomeTax
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= kopn_IiiVProductLineIncludingAllOutstandingEquityInterestInKtcWirelessLlcMember
4,500,000us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodBeforeIncomeTax
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= kopn_IiiVProductLineIncludingAllOutstandingEquityInterestInKtcWirelessLlcMember
   
Provision for income taxes on operations   0us-gaap_DiscontinuedOperationTaxEffectOfIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriod
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= kopn_IiiVProductLineIncludingAllOutstandingEquityInterestInKtcWirelessLlcMember
(1,700,000)us-gaap_DiscontinuedOperationTaxEffectOfIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriod
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= kopn_IiiVProductLineIncludingAllOutstandingEquityInterestInKtcWirelessLlcMember
   
Income from operations, net of tax   (200,000)us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= kopn_IiiVProductLineIncludingAllOutstandingEquityInterestInKtcWirelessLlcMember
2,800,000us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= kopn_IiiVProductLineIncludingAllOutstandingEquityInterestInKtcWirelessLlcMember
   
Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax   20,400,000us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= kopn_IiiVProductLineIncludingAllOutstandingEquityInterestInKtcWirelessLlcMember
0us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= kopn_IiiVProductLineIncludingAllOutstandingEquityInterestInKtcWirelessLlcMember
   
Income from discontinued operations, net of tax   $ 20,200,000us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= kopn_IiiVProductLineIncludingAllOutstandingEquityInterestInKtcWirelessLlcMember
$ 2,800,000us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= kopn_IiiVProductLineIncludingAllOutstandingEquityInterestInKtcWirelessLlcMember