Impairment of equity security.

No definition available.

Name:	KOPN_ImpairmentOfEquitySecurity
Namespace Prefix:	KOPN_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Loss on warrant.

+ References

No definition available.

+ Details

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Namespace Prefix:	KOPN_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Ownership percentage in equity investment warrant.

+ References

No definition available.

+ Details

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Namespace Prefix:	KOPN_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Amount of unrealized gain (loss) recognized in the income statement on unsold other securities.

+ References

No definition available.

+ Details

Name:	KOPN_UnrealizedGainLossOnSecurities1
Namespace Prefix:	KOPN_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

This item represents an other than temporary decline in value that has been recognized against an investment accounted for under the equity method of accounting. The excess of the carrying amount over the fair value of the investment represents the amount of the write down which is or was reflected in earnings. The written down value is a new cost basis with the adjusted value of the investment becoming its new carrying value subject to the equity accounting method. Evidence of a loss in value might include, but would not necessarily be limited to, absence of an ability to recover the carrying amount of the investment or inability of the investee to sustain an earnings capacity which would justify the carrying amount of the investment.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 35
-Paragraph 32
-URI http://asc.fasb.org/extlink&oid=121548190&loc=d3e32787-111569

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=114001798&loc=d3e33918-111571

+ Details

Name:	us-gaap_EquityMethodInvestmentOwnershipPercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Fair value portion of investments accounted under the equity method.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 25
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=117311354&loc=d3e32014-111567

+ Details

Name:	us-gaap_EquityMethodInvestmentsFairValueDisclosure
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Balance Type:	debit
Period Type:	instant

- Definition

Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 45
-Paragraph 1A
-URI http://asc.fasb.org/extlink&oid=99377092&loc=SL75136599-209740

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of unrealized gain (loss) recognized in income from asset measured at fair value on recurring basis using unobservable input (level 3) and still held.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The cash outflow associated with the purchase of or advances to an equity method investments, which are investments in joint ventures and entities in which the entity has an equity ownership interest normally of 20 to 50 percent and exercises significant influence.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 13
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3213-108585

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Details

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- Details

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- Details

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FAIR VALUE MEASUREMENTS (Details Narrative) - USD ($)	3 Months Ended				9 Months Ended		12 Months Ended
FAIR VALUE MEASUREMENTS (Details Narrative) - USD ($)	Dec. 28, 2019	Jun. 29, 2019	Jun. 30, 2018	Mar. 31, 2018	Sep. 26, 2020	Sep. 28, 2019	Dec. 30, 2017	Sep. 30, 2019	May 31, 2019
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Payments to Acquire Equity Method Investments				$ 1,000,000.0		$ 2,500,000
Unrealized Gain (Loss) on Securities		$ 800,000			$ 100,000
Ownership percentage interest					11.00%
Equity Method Investments, Fair Value Disclosure					$ 3,600,000
Impairment of equity security	$ 5,200,000
Solos Inc [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Ownership percentage interest								20.00%
Series A Warrant [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Gain on fair value of warrant							$ 2,000,000.0
Loss on warrant			$ 100,000
Series B [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Equity Securities, FV-NI									$ 2,500,000
Maximum [Member] \| Solos Inc [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Impairment on investment					$ 200,000
Warrant [Member] \| Maximum [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Ownership percentage in equity investment warrant							15.00%