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Accrued Warranty (Details) - USD ($)	12 Months Ended
	Dec. 26, 2015	Dec. 27, 2014
Product Warranties Disclosures [Abstract]
Product warranty term	12 months
Movement in Standard Product Warranty Accrual [Roll Forward]
Beginning Balance	$ 716,000	$ 716,000
Additions	598,000	798,000
Claims and reversals	(796,000)	(798,000)
Ending Balance	$ 518,000	$ 716,000

X

- Definition

Product Warranty Term

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	duration

X

- Definition

Standard Product Warranty Accrual, Payments and Reversals

+ References

No definition available.

+ Details

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Namespace Prefix:	kopn_
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Balance Type:	debit
Period Type:	duration

X

- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
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- References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	na
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X

- Definition

Amount as of the balance sheet date of the aggregate standard product warranty liability. Does not include the balance for the extended product warranty liability.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 460
-SubTopic 10
-Section 50
-Paragraph 8
-Subparagraph (c)(1),(c)(5)
-URI http://asc.fasb.org/extlink&oid=6398077&loc=d3e12565-110249

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Namespace Prefix:	us-gaap_
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Balance Type:	credit
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X

- Definition

Represents the aggregate increase in the liability for accruals related to standard product warranties issued during the reporting period. Does not include any increase in the liability for accruals related to extended product warranties.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 460
-SubTopic 10
-Section 50
-Paragraph 8
-Subparagraph ((c)(3))
-URI http://asc.fasb.org/extlink&oid=6398077&loc=d3e12565-110249

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Balance Type:	credit
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