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Business Combinations (Details) (USD $)	12 Months Ended			1 Months Ended
	Dec. 27, 2014	Dec. 28, 2013	Dec. 29, 2012	Apr. 30, 2013	Apr. 17, 2013
Business Acquisition [Line Items]
Payments to Acquire Investments	$ 0us-gaap_PaymentsToAcquireInvestments	$ 3,583,611us-gaap_PaymentsToAcquireInvestments	$ 2,249,784us-gaap_PaymentsToAcquireInvestments
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Less Noncontrolling Interest [Abstract]
Goodwill	976,451us-gaap_Goodwill	1,016,132us-gaap_Goodwill	684,789us-gaap_Goodwill
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Changes, Additional Interest Issued to Parent	0.29us-gaap_ConsolidationLessThanWhollyOwnedSubsidiaryParentOwnershipInterestChangesAdditionalInterestIssuedToParent
eMDT
Business Acquisition [Line Items]
Cumulative percentage of voting interests acquired				51.00%kopn_CumulativePercentageOfVotingInterestsAcquired / us-gaap_BusinessAcquisitionAxis = kopn_EMDTMember
Business Combination, Consideration Transferred				400,000us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = kopn_EMDTMember
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Less Noncontrolling Interest [Abstract]
Goodwill					400,000us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = kopn_EMDTMember
Net loss included in consolidated operations		300,000us-gaap_BusinessCombinationProFormaInformationEarningsOrLossOfAcquireeSinceAcquisitionDateActual / us-gaap_BusinessAcquisitionAxis = kopn_EMDTMember
Noncontrolling Interest | Business Acquisition Two
Business Acquisition [Line Items]
Payments to Acquire Investments				$ 200,000us-gaap_PaymentsToAcquireInvestments / us-gaap_BusinessAcquisitionAxis = kopn_BusinessAcquisitionTwoMember / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember
eMDT
Business Acquisition [Line Items]
Kopin's ownership percentage	80.00%us-gaap_MinorityInterestOwnershipPercentageByParent / dei_LegalEntityAxis = kopn_EMDTMember

X

- Definition

Cumulative Percentage of Voting Interests Acquired

+ References

No definition available.

+ Details

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Namespace Prefix:	kopn_
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Balance Type:	na
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X

- Details

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Period Type:	duration

X

- Definition

Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 30

-Section 30

-Paragraph 7

-URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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-SubTopic 30

-Section 30

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Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

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-Section 50

-Paragraph 1

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479

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X

- Definition

This element represents the amount of earnings or loss of the acquiree since the acquisition date included in the consolidated income statement for the reporting period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (h)(1)

-URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463

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X

- Definition

Represents a (noncash) issuance of additional equity interests to the parent by a subsidiary during the period, thereby effecting a change in total (consolidated) equity attributable to the parent. The additional equity interest represented by this element increases the parent's controlling interest in the subsidiary.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 810

-SubTopic 10

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-Paragraph 1A

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Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

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-Section S99

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-Paragraph 4M

-URI http://asc.fasb.org/extlink&oid=35736750&loc=SL4591554-111686

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X

- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 20

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267



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X

- Definition

The parent entity's interest in net assets of the subsidiary, expressed as a percentage.

+ References

No definition available.

+ Details

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X

- Definition

The cash outflow associated with the purchase of all investments (debt, security, other) during the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

-URI http://asc.fasb.org/extlink&oid=6516133



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-Name Accounting Standards Codification

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-Section 45

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