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Supply Chain Fraud Matter - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 27, 2025 | Dec. 28, 2024 | Dec. 30, 2023 | Dec. 31, 2022
Supply Chain Fraud Matter [Line Items] |  |  |  |
Pre tax expense per share | $ 0.1 |  |  |
Percentage of supply chain fraud matter in consolidated revenue and purchased transportation |  | 2.00% | 1.00% |
Maximum |  |  |  |
Supply Chain Fraud Matter [Line Items] |  |  |  |
Percentage of supply chain fraud matter in consolidated revenue and purchased transportation |  |  |  | 0.50%
Percentage of supply chain fraud matter in operating income and net income |  | 1.00% | 0.20% | 0.20%
Cargo and Freight |  |  |  |
Supply Chain Fraud Matter [Line Items] |  |  |  |
Freight pre-tax expense | $ 4.8 |  |  |

X
- Definition Freight pre tax expense. + References No definition available. + Details
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Namespace Prefix: | lstr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Percentage of supply chain fraud matter in consolidated revenue and purchased transportation. + References No definition available. + Details
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Namespace Prefix: | lstr_
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X
- Definition Percentage of supply chain fraud matter in operating income and net income. + References No definition available. + Details
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Namespace Prefix: | lstr_
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X
- Definition Pre tax Expense per share. + References No definition available. + Details
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Balance Type: | na
Period Type: | duration

X
- Definition Supply Chain Fraud Matter Line item + References No definition available. + Details
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Namespace Prefix: | lstr_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |