Amount of commitment fee amortized in a line of credit facility.

No definition available.

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Namespace Prefix:	lscc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of unamortized commitment fees for a line of credit facility.

+ References

No definition available.

+ Details

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Namespace Prefix:	lscc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The percentage of the principal that is payable during certain periods under a line of credit facility in the first year.

+ References

No definition available.

+ Details

Name:	lscc_LineOfCreditFacilityPercentageOfPrincipalPayableYearOne
Namespace Prefix:	lscc_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The percentage of the principal that is payable during certain periods under a line of credit facility in the second year through the fourth.

+ References

No definition available.

+ Details

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Namespace Prefix:	lscc_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The percentage of the principal that is payable during certain periods under a line of credit facility in the years after the fourth.

+ References

No definition available.

+ Details

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Namespace Prefix:	lscc_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 942
-SubTopic 210
-Name Accounting Standards Codification
-Section S45
-Paragraph 1
-Publisher FASB
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Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
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Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 942
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-Name Accounting Standards Codification
-Section S99
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Reference 4: http://www.xbrl.org/2003/role/disclosureRef
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-Publisher FASB
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+ Details

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

- Definition

Period between issuance and maturity of debt instrument, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentTerm
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of the fee for available but unused credit capacity under the credit facility.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 942
-SubTopic 210
-Name Accounting Standards Codification
-Section S45
-Paragraph 1
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+ Details

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

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S50
-Paragraph 8
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480657/210-10-S50-8

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
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-Subparagraph (SX 210.5-02(19)(b))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

+ Details

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

- Definition

Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

+ References

+ Details

Name:	us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of cash inflow from contractual arrangement with the lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 235
-SubTopic 10
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-Publisher FASB
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-URI https://asc.fasb.org/1943274/2147482740/230-10-45-14

+ Details

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

- Details

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Balance Type:
Period Type:

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- Details

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Namespace Prefix:
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Balance Type:
Period Type:

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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Note 5 - Long-term Debt (Details Textual) - USD ($) $ in Thousands			6 Months Ended
	Jul. 27, 2026	Jul. 04, 2026	Jul. 04, 2026	Jun. 30, 2026	Jan. 03, 2026
The 2026 Credit Agreement [Member]
Line of Credit Facility, Commitment Fee Amount		$ 6,600
Long-Term Debt, Gross		$ 0	$ 0
The 2026 Credit Agreement [Member] \| Base Rate [Member] \| Minimum [Member]
Debt Instrument, Basis Spread on Variable Rate	0.00%
The 2026 Credit Agreement [Member] \| Base Rate [Member] \| Maximum [Member]
Debt Instrument, Basis Spread on Variable Rate	0.75%
The 2026 Credit Agreement [Member] \| Secured Overnight Financing Rate (SOFR) [Member] \| Minimum [Member]
Debt Instrument, Basis Spread on Variable Rate	1.00%
The 2026 Credit Agreement [Member] \| Secured Overnight Financing Rate (SOFR) [Member] \| Maximum [Member]
Debt Instrument, Basis Spread on Variable Rate	1.75%
The 2026 Credit Agreement [Member] \| Senior Secured Revolving Loan Facility [Member]
Line of Credit Facility, Maximum Borrowing Capacity				$ 200,000
The 2026 Credit Agreement [Member] \| Senior Secured Delayed Draw Term Loan Facility [Member]
Line of Credit Facility, Maximum Borrowing Capacity				$ 950,000
Proceeds from Lines of Credit	$ 925,000
Line of Credit Facility, Remaining Borrowing Capacity	$ 25,000
Line of Credit Facility, Percentage of Principal Payable, Year One	1.25%
Line of Credit Facility, Percentage of Principal Payable, Year Two Through Four	1.875%
Line of Credit Facility, Percentage of Principal Payments, After Year Four	2.50%
The 2022 Credit Agreement [Member[
Long-Term Debt, Gross					$ 0
Line of Credit Facility, Commitment Fee, Unamortized			200
Senior Secured Bridge Facility [Member]
Line of Credit Facility, Commitment Fee Amount			$ 5,600
Debt Instrument, Term (Year)			1 year
Line Of Credit Facility , Commitment Fee, Amortized			$ 900
Line of Credit Facility, Commitment Fee, Unamortized			$ 4,700