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Operating Property - Additional Information (Detail) - USD ($) | 12 Months Ended
--- | ---
Dec. 26, 2020 | Dec. 28, 2019 | Dec. 29, 2018
Property, Plant and Equipment [Line Items] |  |  |
Finance leased assets gross | $ 199,045,000 | $ 222,993,000 |
Finance leases balance sheet assets by major class net. | 139,259,000 | 156,439,000 |
Finance leases | $ 31,633,000 | $ 29,054,000 | $ 46,595,000

X
- Definition Finance lease obligations incurred + References No definition available. + Details
Name: | lstr_FinanceLeaseObligationsIncurred
Namespace Prefix: | lstr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Finance leased assets gross. + References No definition available. + Details
Name: | lstr_FinanceLeasedAssetsGross
Namespace Prefix: | lstr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Finance Leases Balance Sheet Assets By Major Class Net + References No definition available. + Details
Name: | lstr_FinanceLeasesBalanceSheetAssetsByMajorClassNet
Namespace Prefix: | lstr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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_PropertyPlantAndEquipmentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration