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Lease Commitments - Narrative (Details) $ in Thousands | 12 Months Ended
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Dec. 26, 2020 USD ($) renewal | Dec. 28, 2019 USD ($) | Dec. 29, 2018 USD ($)
Leases [Abstract] |  |  |
Number of renewal options | renewal | 1 |  |
Operating lease, rent expense | $ 10,410 | $ 10,142 |
Operating lease, rent expense |  |  | $ 9,600

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- Definition Lessor, Operating Lease, Number Of Renewal Options + References No definition available. + Details
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Namespace Prefix: | lfus_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Definition Amount of rent expense incurred for leased assets, including but not limited to, furniture and equipment, that is not directly or indirectly associated with the manufacture, sale or creation of a product or product line. + References No definition available. + Details
Name: | us-gaap_LeaseAndRentalExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_LeasesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of operating lease expense. Excludes sublease income. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121603541&loc=SL77918638-209977 + Details
Name: | us-gaap_OperatingLeaseExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration