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Summary of Significant Accounting Policies and Other Information (Details) customer in Thousands, associate in Thousands	9 Months Ended
	Oct. 01, 2022 customer associate country
Accounting Policies [Abstract]
Countries where product is used (country) | country	15
Global associates (associate) | associate	19
Number of customers (over) | customer	100

X

- Definition

Global Associates

+ References

No definition available.

+ Details

Name:	lfus_GlobalAssociates
Namespace Prefix:	lfus_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Definition

The number of customers that a company has.

+ References

No definition available.

+ Details

Name:	lfus_NumberOfCustomers
Namespace Prefix:	lfus_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

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

X

- Definition

The number of countries in which the entity operates as of balance sheet date.

+ References

No definition available.

+ Details

Name:	us-gaap_NumberOfCountriesInWhichEntityOperates
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant