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v2.4.1.9

Accrued Warranty (Details) (USD $) | 12 Months Ended
--- | ---
Dec. 27, 2014 | Dec. 28, 2013
Product Warranties Disclosures [Abstract] |  |
Product warranty term | 12 months |
Movement in Standard Product Warranty Accrual [Roll Forward] |  |
Beginning Balance | $ 716,000 us-gaap_StandardProductWarrantyAccrual | $ 716,000 us-gaap_StandardProductWarrantyAccrual
Additions | 389,000 us-gaap_StandardProductWarrantyAccrualWarrantiesIssued | 798,000 us-gaap_StandardProductWarrantyAccrualWarrantiesIssued
Claims and reversals | (389,000)kopn_StandardProductWarrantyAccrualPaymentsAndReversals | (798,000)kopn_StandardProductWarrantyAccrualPaymentsAndReversals
Ending Balance | $ 716,000 us-gaap_StandardProductWarrantyAccrual | $ 716,000 us-gaap_StandardProductWarrantyAccrual

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- Definition Product Warranty Term + References No definition available. + Details
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Balance Type: | na
Period Type: | duration

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- Definition Standard Product Warranty Accrual, Payments and Reversals + References No definition available. + Details
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Namespace Prefix: | kopn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Details
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Namespace Prefix: | us-gaap_
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- Details
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- 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 + Details
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Balance Type: | credit
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- 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 + Details
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