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Held for Sale Subsidiary - Additional Information (Detail) - Landstar Metro [Member]	9 Months Ended
	Sep. 27, 2025 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Goodwill, Impairment Loss	$ 7,530,000
Impairment of Long-Lived Assets to be Disposed of	$ 8,612,000

X

- Definition

Amount of impairment loss from asset representing future economic benefit arising from other asset acquired in business combination or from joint venture formation or both, that is not individually identified and separately recognized.

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The aggregate amount of write-downs for impairments recognized during the period for long-lived assets held for abandonment, exchange or sale.

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