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Schedule of Satisfaction of Performance Obligations (Details)	12 Months Ended
	Dec. 26, 2020	Dec. 28, 2019	Dec. 29, 2018
Transferred at Point in Time [Member]
Disaggregation of Revenue [Line Items]
Revenue percentage from products and services transferred customers	34.00%	64.00%	60.00%
Transferred over Time [Member]
Disaggregation of Revenue [Line Items]
Revenue percentage from products and services transferred customers	66.00%	36.00%	40.00%

X

- Definition

Revenue percentage from products and services transferred customers.

+ References

No definition available.

+ Details

Name:	KOPN_RevenuePercentagefromProductsandServicesTransferredCustomers
Namespace Prefix:	KOPN_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- 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

Name:	us-gaap_DisaggregationOfRevenueLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_TimingOfTransferOfGoodOrServiceAxis=us-gaap_TransferredAtPointInTimeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_TimingOfTransferOfGoodOrServiceAxis=us-gaap_TransferredOverTimeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: