$LSTR
LANDSTAR SYSTEM INC Stock $lstr

$lstr Overview Financials Valuation SEC Filings Company Website

2024 Q1 Form 10-K Financial Statement

#000119312524044902 Filed on February 26, 2024

Income Statement

Concept	2024 Q1	2023 Q4	2023
Revenue	$1.174B	$1.208B	$5.313B
YoY Change		-27.94%	-28.55%
Cost Of Revenue	$1.003B	$1.026B	$4.531B
YoY Change		-28.77%	-29.41%
Gross Profit	$171.7M	$181.4M	$782.5M
YoY Change		-22.84%	-23.34%
Gross Profit Margin	14.62%	15.02%	14.73%
Selling, General & Admin	$82.69M	$80.00M	$326.0M
YoY Change		-6.6%	47.34%
% of Gross Profit	48.17%	44.1%	41.66%
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$14.14M	$13.66M	$58.15M
YoY Change		-7.9%	1.22%
% of Gross Profit	8.24%	7.53%	7.43%
Operating Expenses	$111.7M	$106.8M	$438.4M
YoY Change		-3.56%	98.11%
Operating Profit	$59.96M	$74.57M	$344.1M
YoY Change		-40.03%	-39.74%
Interest Expense	$1.611M	$1.867M	$3.946M
YoY Change		-641.16%	-209.01%
% of Operating Profit	2.69%	2.5%	1.15%
Other Income/Expense, Net
YoY Change
Pretax Income	$61.57M	$76.43M	$348.1M
YoY Change		-38.35%	-38.66%
Income Tax	$14.48M	$18.45M	$83.70M
% Of Pretax Income	23.51%	24.13%	24.05%
Net Earnings	$47.10M	$57.99M	$264.4M
YoY Change		-37.85%	-38.64%
Net Earnings / Revenue	4.01%	4.8%	4.98%
Basic Earnings Per Share	$1.32		$7.36
Diluted Earnings Per Share	$1.32	$1.62	$7.36
COMMON SHARES
Basic Shares Outstanding	35.72M	35.95M	35.92M
Diluted Shares Outstanding	35.75M		35.92M

Balance Sheet

Concept	2024 Q1	2023 Q4	2023
SHORT-TERM ASSETS
Cash & Short-Term Investments	$530.5M	$540.7M	$540.7M
YoY Change		37.4%	37.4%
Cash & Equivalents	$467.7M	$481.0M	$481.0M
Short-Term Investments	$62.78M	$59.66M	$59.66M
Other Short-Term Assets	$15.54M	$24.94M	$24.94M
YoY Change		14.25%	14.25%
Inventory
Prepaid Expenses
Receivables	$723.8M	$743.8M	$743.8M
Other Receivables	$40.53M	$43.34M	$43.34M
Total Short-Term Assets	$1.310B	$1.353B	$1.353B
YoY Change		-6.02%	-6.02%
LONG-TERM ASSETS
Property, Plant & Equipment	$279.6M	$284.3M	$284.3M
YoY Change		-9.74%	-10.33%
Goodwill	$42.38M	$42.28M
YoY Change		2.56%
Intangibles
YoY Change
Long-Term Investments
YoY Change
Other Assets	$113.5M	$122.5M	$122.5M
YoY Change		-10.09%	-8.72%
Total Long-Term Assets	$435.5M	$449.1M	$449.1M
YoY Change		-8.81%	-8.81%
TOTAL ASSETS
Total Short-Term Assets	$1.310B	$1.353B	$1.353B
Total Long-Term Assets	$435.5M	$449.1M	$449.1M
Total Assets	$1.746B	$1.802B	$1.802B
YoY Change		-6.73%	-6.73%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$384.3M	$396.0M	$396.0M
YoY Change		-24.91%	-24.91%
Accrued Expenses	$791.0K	$832.0K	$832.0K
YoY Change		6.39%	6.39%
Deferred Revenue
YoY Change
Short-Term Debt	$51.67M	$61.54M	$61.54M
YoY Change		-33.79%	-33.79%
Long-Term Debt Due	$26.73M	$27.88M	$27.88M
YoY Change		-22.94%	-22.94%
Total Short-Term Liabilities	$589.7M	$675.2M	$675.2M
YoY Change		-23.11%	-23.11%
LONG-TERM LIABILITIES
Long-Term Debt	$38.50M	$43.26M	$43.26M
YoY Change		-35.64%	-35.64%
Other Long-Term Liabilities	$59.67M	$58.92M	$58.92M
YoY Change		-1.02%	-1.02%
Total Long-Term Liabilities	$98.16M	$102.2M	$102.2M
YoY Change		-19.38%	-19.38%
TOTAL LIABILITIES
Total Short-Term Liabilities	$589.7M	$675.2M	$675.2M
Total Long-Term Liabilities	$98.16M	$102.2M	$102.2M
Total Liabilities	$727.9M	$817.9M	$817.9M
YoY Change		-21.7%	-21.7%
SHAREHOLDERS EQUITY
Retained Earnings	$2.819B	$2.784B
YoY Change		5.6%
Common Stock	$254.9M	$255.3M
YoY Change		-1.48%
Preferred Stock
YoY Change
Treasury Stock (at cost)	$2.049B	$2.048B
YoY Change		2.77%
Treasury Stock Shares
Shareholders Equity	$1.018B	$983.9M	$983.9M
YoY Change
Total Liabilities & Shareholders Equity	$1.746B	$1.802B	$1.802B
YoY Change		-6.73%	-6.73%

Cashflow Statement

Concept	2024 Q1	2023 Q4	2023
OPERATING ACTIVITIES
Net Income	$47.10M	$57.99M	$264.4M
YoY Change		-37.85%	-38.64%
Depreciation, Depletion And Amortization	$14.14M	$13.66M	$58.15M
YoY Change		-7.9%	1.22%
Cash From Operating Activities	$94.21M	$89.85M	$393.6M
YoY Change		-51.77%	-36.78%
INVESTING ACTIVITIES
Capital Expenditures	$9.281M	$10.29M	$25.69M
YoY Change		109.57%	-1.22%
Acquisitions
YoY Change
Other Investing Activities	$5.639M	$5.410M	$19.21M
YoY Change		-16.58%	1457.99%
Cash From Investing Activities	-$3.642M	-$4.878M	-$6.478M
YoY Change		-409.52%	-73.85%
FINANCING ACTIVITIES
Cash Dividend Paid	$83.24M		$117.1M
YoY Change			1.26%
Common Stock Issuance & Retirement, Net
YoY Change
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	-103.4M	-45.17M	-248.0M
YoY Change		77.22%	-47.87%
NET CHANGE
Cash From Operating Activities	94.21M	89.85M	393.6M
Cash From Investing Activities	-3.642M	-4.878M	-6.478M
Cash From Financing Activities	-103.4M	-45.17M	-248.0M
Net Change In Cash	-13.37M	39.80M	141.5M
YoY Change		-75.49%	17.88%
FREE CASH FLOW
Cash From Operating Activities	$94.21M	$89.85M	$393.6M
Capital Expenditures	$9.281M	$10.29M	$25.69M
Free Cash Flow	$84.93M	$79.56M	$368.0M
YoY Change		-56.13%	-38.33%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value
CY2023	dei	Amendment Flag AmendmentFlag	false
CY2023	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	FY
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CY2022Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	393274000
CY2023Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	284300000
CY2022Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	314990000
CY2023	dei	Entity Central Index Key EntityCentralIndexKey	0000853816
CY2023	dei	Document Type DocumentType	10-K
CY2023	dei	Document Annual Report DocumentAnnualReport	true
CY2023	dei	Document Period End Date DocumentPeriodEndDate	2023-12-30
CY2023	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-30
CY2023	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2023
CY2023	dei	Document Transition Report DocumentTransitionReport	false
CY2023	dei	Entity File Number EntityFileNumber	0-21238
CY2023	dei	Entity Registrant Name EntityRegistrantName	Landstar System, Inc.
CY2023	dei	Entity Incorporation State Country Code EntityIncorporationStateCountryCode	DE
CY2023	dei	Entity Tax Identification Number EntityTaxIdentificationNumber	06-1313069
CY2023	dei	Entity Address Address Line1 EntityAddressAddressLine1	13410 Sutton Park Drive South
CY2023	dei	Entity Address Postal Zip Code EntityAddressPostalZipCode	32224
CY2023	dei	Entity Address City Or Town EntityAddressCityOrTown	Jacksonville
CY2023	dei	Entity Address State Or Province EntityAddressStateOrProvince	FL
CY2023	dei	City Area Code CityAreaCode	904
CY2023	dei	Local Phone Number LocalPhoneNumber	398-9400
CY2023	dei	Security12b Title Security12bTitle	Common Stock
CY2023	dei	Trading Symbol TradingSymbol	LSTR
CY2023	dei	Security Exchange Name SecurityExchangeName	NASDAQ
CY2023	dei	Entity Well Known Seasoned Issuer EntityWellKnownSeasonedIssuer	Yes
CY2023	dei	Entity Voluntary Filers EntityVoluntaryFilers	No
CY2023	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
CY2023	dei	Entity Interactive Data Current EntityInteractiveDataCurrent	Yes
CY2023	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
CY2023	dei	Entity Small Business EntitySmallBusiness	false
CY2023	dei	Entity Emerging Growth Company EntityEmergingGrowthCompany	false
CY2023	dei	Icfr Auditor Attestation Flag IcfrAuditorAttestationFlag	true
CY2023	dei	Document Fin Stmt Error Correction Flag DocumentFinStmtErrorCorrectionFlag	false
CY2023	dei	Entity Shell Company EntityShellCompany	false
CY2023Q3	dei	Entity Public Float EntityPublicFloat	6856148000
CY2024Q1	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	35716673
CY2023Q4	us-gaap	Operating Lease Right Of Use Asset Statement Of Financial Position Extensible List OperatingLeaseRightOfUseAssetStatementOfFinancialPositionExtensibleList	http://fasb.org/us-gaap/2023#OtherAssetsNoncurrent
CY2023Q4	us-gaap	Operating Lease Liability Current Statement Of Financial Position Extensible List OperatingLeaseLiabilityCurrentStatementOfFinancialPositionExtensibleList	http://fasb.org/us-gaap/2023#OtherLiabilitiesCurrent
CY2023Q4	us-gaap	Operating Lease Liability Noncurrent Statement Of Financial Position Extensible List OperatingLeaseLiabilityNoncurrentStatementOfFinancialPositionExtensibleList	http://fasb.org/us-gaap/2023#DeferredIncomeTaxesAndOtherLiabilitiesNoncurrent
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CY2023Q4	us-gaap	Short Term Investments ShortTermInvestments	59661000
CY2022Q4	us-gaap	Short Term Investments ShortTermInvestments	53955000
CY2023Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	11738000
CY2022Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	12121000
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CY2022Q4	us-gaap	Receivables Net Current ReceivablesNetCurrent	967793000
CY2023Q4	us-gaap	Allowance For Doubtful Accounts Premiums And Other Receivables AllowanceForDoubtfulAccountsPremiumsAndOtherReceivables	14010000
CY2022Q4	us-gaap	Allowance For Doubtful Accounts Premiums And Other Receivables AllowanceForDoubtfulAccountsPremiumsAndOtherReceivables	10579000
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CY2022Q4	us-gaap	Other Receivables OtherReceivables	56235000
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CY2022Q4	us-gaap	Other Assets Current OtherAssetsCurrent	21826000
CY2023Q4	us-gaap	Assets Current AssetsCurrent	1352741000
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CY2022Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	136279000
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CY2023Q4	us-gaap	Self Insurance Reserve Current SelfInsuranceReserveCurrent	41825000
CY2022Q4	us-gaap	Self Insurance Reserve Current SelfInsuranceReserveCurrent	50836000
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CY2022Q4	us-gaap	Other Liabilities Current OtherLiabilitiesCurrent	98945000
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CY2022Q4	us-gaap	Liabilities Current LiabilitiesCurrent	878135000
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CY2022Q4	us-gaap	Finance Lease Liability Noncurrent FinanceLeaseLiabilityNoncurrent	67225000
CY2023Q4	us-gaap	Self Insurance Reserve Noncurrent SelfInsuranceReserveNoncurrent	58922000
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CY2023Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	1801846000
CY2022Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	1931879000
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CY2023	us-gaap	Proceeds From Sale And Maturity Of Marketable Securities ProceedsFromSaleAndMaturityOfMarketableSecurities	112555000
CY2022	us-gaap	Proceeds From Sale And Maturity Of Marketable Securities ProceedsFromSaleAndMaturityOfMarketableSecurities	41198000
CY2021	us-gaap	Proceeds From Sale And Maturity Of Marketable Securities ProceedsFromSaleAndMaturityOfMarketableSecurities	31938000
CY2023	us-gaap	Payments To Acquire Marketable Securities PaymentsToAcquireMarketableSecurities	101639000
CY2022	us-gaap	Payments To Acquire Marketable Securities PaymentsToAcquireMarketableSecurities	40202000
CY2022	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesTax	-2345000
CY2021	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesTax	-739000
CY2023	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	3439000
CY2022	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	-8562000
CY2021	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	-2695000
CY2023	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	4720000
CY2022	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	-1059000
CY2021	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	-709000
CY2023	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	8159000
CY2022	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-9621000
CY2021	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-3404000
CY2023	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	272553000
CY2022	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	421293000
CY2021	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	378120000
CY2023	us-gaap	Profit Loss ProfitLoss	264394000
CY2022	us-gaap	Profit Loss ProfitLoss	430914000
CY2021	us-gaap	Profit Loss ProfitLoss	381524000
CY2023	us-gaap	Depreciation And Amortization DepreciationAndAmortization	58153000
CY2022	us-gaap	Depreciation And Amortization DepreciationAndAmortization	57453000
CY2021	us-gaap	Depreciation And Amortization DepreciationAndAmortization	49609000
CY2023	us-gaap	Amortization Of Financing Costs AmortizationOfFinancingCosts	263000
CY2022	us-gaap	Amortization Of Financing Costs AmortizationOfFinancingCosts	355000
CY2021	us-gaap	Amortization Of Financing Costs AmortizationOfFinancingCosts	447000
CY2023	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	14032000
CY2022	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	12220000
CY2021	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	5722000
CY2023	us-gaap	Gain Loss On Sale Of Property Plant Equipment GainLossOnSaleOfPropertyPlantEquipment	4574000
CY2022	us-gaap	Gain Loss On Sale Of Property Plant Equipment GainLossOnSaleOfPropertyPlantEquipment	2944000
CY2021	us-gaap	Gain Loss On Sale Of Property Plant Equipment GainLossOnSaleOfPropertyPlantEquipment	1830000
CY2023	us-gaap	Increase Decrease In Deferred Income Taxes IncreaseDecreaseInDeferredIncomeTaxes	7709000
CY2022	us-gaap	Increase Decrease In Deferred Income Taxes IncreaseDecreaseInDeferredIncomeTaxes	5360000
CY2021	us-gaap	Increase Decrease In Deferred Income Taxes IncreaseDecreaseInDeferredIncomeTaxes	3790000
CY2023	us-gaap	Share Based Compensation ShareBasedCompensation	4282000
CY2022	us-gaap	Share Based Compensation ShareBasedCompensation	12399000
CY2021	us-gaap	Share Based Compensation ShareBasedCompensation	27537000
CY2023	us-gaap	Increase Decrease In Receivables IncreaseDecreaseInReceivables	-222895000
CY2022	us-gaap	Increase Decrease In Receivables IncreaseDecreaseInReceivables	-219190000
CY2021	us-gaap	Increase Decrease In Receivables IncreaseDecreaseInReceivables	362234000
CY2023	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	2544000
CY2022	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	5938000
CY2021	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	-4444000
CY2023	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	-131392000
CY2022	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	-76758000
CY2021	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	224125000
CY2023	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	-15795000
CY2022	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	-31571000
CY2021	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	43422000
CY2023	us-gaap	Increase Decrease In Insurance Liabilities IncreaseDecreaseInInsuranceLiabilities	-8357000
CY2022	us-gaap	Increase Decrease In Insurance Liabilities IncreaseDecreaseInInsuranceLiabilities	12699000
CY2021	us-gaap	Increase Decrease In Insurance Liabilities IncreaseDecreaseInInsuranceLiabilities	-92236000
CY2023	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	393648000
CY2022	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	622659000
CY2021	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	276740000
CY2021	us-gaap	Payments To Acquire Marketable Securities PaymentsToAcquireMarketableSecurities	84992000
CY2023	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	25688000
CY2022	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	26005000
CY2021	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	23261000
CY2023	us-gaap	Proceeds From Sale Of Property Plant And Equipment ProceedsFromSaleOfPropertyPlantAndEquipment	8294000
CY2022	us-gaap	Proceeds From Sale Of Property Plant And Equipment ProceedsFromSaleOfPropertyPlantAndEquipment	5236000
CY2021	us-gaap	Proceeds From Sale Of Property Plant And Equipment ProceedsFromSaleOfPropertyPlantAndEquipment	2971000
CY2023	us-gaap	Payments To Acquire Other Investments PaymentsToAcquireOtherInvestments	0
CY2022	us-gaap	Payments To Acquire Other Investments PaymentsToAcquireOtherInvestments	4999000
CY2021	us-gaap	Payments To Acquire Other Investments PaymentsToAcquireOtherInvestments	0
CY2023	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-6478000
CY2022	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-24772000
CY2021	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-73344000
CY2023	us-gaap	Proceeds From Repayments Of Bank Overdrafts ProceedsFromRepaymentsOfBankOverdrafts	-31412000
CY2022	us-gaap	Proceeds From Repayments Of Bank Overdrafts ProceedsFromRepaymentsOfBankOverdrafts	-23525000
CY2021	us-gaap	Proceeds From Repayments Of Bank Overdrafts ProceedsFromRepaymentsOfBankOverdrafts	41730000
CY2023	us-gaap	Payments Of Dividends PaymentsOfDividends	117130000
CY2022	us-gaap	Payments Of Dividends PaymentsOfDividends	115671000
CY2021	us-gaap	Payments Of Dividends PaymentsOfDividends	111961000
CY2023	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	0
CY2022	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	1080000
CY2021	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	0
CY2023	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	28000
CY2022	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	68000
CY2021	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	160000
CY2023	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	9185000
CY2022	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	10428000
CY2021	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	2342000
CY2023	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	53919000
CY2022	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	285983000
CY2021	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	122722000
CY2023	us-gaap	Repayments Of Long Term Debt And Capital Securities RepaymentsOfLongTermDebtAndCapitalSecurities	36353000
CY2022	us-gaap	Repayments Of Long Term Debt And Capital Securities RepaymentsOfLongTermDebtAndCapitalSecurities	39063000
CY2021	us-gaap	Repayments Of Long Term Debt And Capital Securities RepaymentsOfLongTermDebtAndCapitalSecurities	37644000
CY2023	us-gaap	Payment For Contingent Consideration Liability Financing Activities PaymentForContingentConsiderationLiabilityFinancingActivities	0
CY2022	us-gaap	Payment For Contingent Consideration Liability Financing Activities PaymentForContingentConsiderationLiabilityFinancingActivities	0
CY2021	us-gaap	Payment For Contingent Consideration Liability Financing Activities PaymentForContingentConsiderationLiabilityFinancingActivities	168000
CY2023	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-247971000
CY2022	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-475682000
CY2021	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-232947000
CY2023	us-gaap	Effect Of Exchange Rate On Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	2263000
CY2022	us-gaap	Effect Of Exchange Rate On Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	-2195000
CY2021	us-gaap	Effect Of Exchange Rate On Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	-232000
CY2023	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	141462000
CY2022	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	120010000
CY2021	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	-29783000
CY2022Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	339581000
CY2021Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	219571000
CY2020Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	249354000
CY2023Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	481043000
CY2022Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	339581000
CY2021Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	219571000
CY2020Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	691835000
CY2021	us-gaap	Profit Loss ProfitLoss	381524000
CY2021	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	2.92
CY2021	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	110578000
CY2021	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	122722000
CY2021	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	-2182000
CY2021	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	27537000
CY2021	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-3404000
CY2021Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	862010000
CY2022	us-gaap	Profit Loss ProfitLoss	430914000
CY2022	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	3.1
CY2022	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	112138000
CY2022	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	285983000
CY2022	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	-10360000
CY2022	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	12399000
CY2022	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-9621000
CY2022Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	887221000
CY2023	us-gaap	Profit Loss ProfitLoss	264394000
CY2023	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	3.26
CY2023	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	116709000
CY2023	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	54267000
CY2023	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	-9157000
CY2023	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	4282000
CY2023	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	8159000
CY2023Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	983923000
CY2023	us-gaap	Use Of Estimates UseOfEstimates	<div style="font-family: "Times New Roman"; font-size: 10pt; margin-top: 18pt; margin-bottom: 0pt; margin-left: 2%;;text-indent: 0px;"><div style="letter-spacing: 0px; top: 0px;;display:inline;"><div style="font-weight:bold;display:inline;"><div style="font-style: normal; letter-spacing: 0px; top: 0px;;display:inline;"><div style="font-style:italic;display:inline;">Estimates </div></div></div></div></div> <div style="font-weight:bold;display:inline;"><div style="font-style: normal; letter-spacing: 0px; top: 0px;;display:inline;"><div style="font-style:italic;display:inline;"> </div></div></div> <div style="margin-top:6pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">The preparation of the consolidated financial statements requires the use of management’s estimates. Actual results could differ from those estimates. </div>
CY2023	us-gaap	Fiscal Period FiscalPeriod	<div style="font-family: "Times New Roman"; font-size: 10pt; margin-top: 18pt; margin-bottom: 0pt; margin-left: 2%;;text-indent: 0px;"><div style="letter-spacing: 0px; top: 0px;;display:inline;"><div style="font-weight:bold;display:inline;"><div style="font-style: normal; letter-spacing: 0px; top: 0px;;display:inline;"><div style="font-style:italic;display:inline;">Fiscal Year </div></div></div></div></div> <div style="font-weight:bold;display:inline;"><div style="font-style: normal; letter-spacing: 0px; top: 0px;;display:inline;"><div style="font-style:italic;display:inline;"> </div></div></div> <div style="margin-top:6pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">Landstar’s fiscal year is the 52 or 53 week period ending the last Saturday in December. </div>
CY2023Q4	us-gaap	Restricted Cash RestrictedCash	0
CY2022Q4	us-gaap	Restricted Cash RestrictedCash	0
CY2021Q4	us-gaap	Restricted Cash RestrictedCash	4049000
CY2021Q4	us-gaap	Short Term Investments ShortTermInvestments	35778000
CY2022Q4	us-gaap	Valuation Allowances And Reserves Balance ValuationAllowancesAndReservesBalance	24069000
CY2023	us-gaap	Valuation Allowances And Reserves Charged To Cost And Expense ValuationAllowancesAndReservesChargedToCostAndExpense	14032000
CY2023	us-gaap	Valuation Allowances And Reserves Adjustments ValuationAllowancesAndReservesAdjustments	-10781000
CY2023Q4	us-gaap	Valuation Allowances And Reserves Balance ValuationAllowancesAndReservesBalance	27320000
CY2021Q4	us-gaap	Valuation Allowances And Reserves Balance ValuationAllowancesAndReservesBalance	16785000
CY2022	us-gaap	Valuation Allowances And Reserves Charged To Cost And Expense ValuationAllowancesAndReservesChargedToCostAndExpense	12220000
CY2022	us-gaap	Valuation Allowances And Reserves Adjustments ValuationAllowancesAndReservesAdjustments	-4936000
CY2022Q4	us-gaap	Valuation Allowances And Reserves Balance ValuationAllowancesAndReservesBalance	24069000
CY2020Q4	us-gaap	Valuation Allowances And Reserves Balance ValuationAllowancesAndReservesBalance	17333000
CY2021	us-gaap	Valuation Allowances And Reserves Charged To Cost And Expense ValuationAllowancesAndReservesChargedToCostAndExpense	5722000
CY2021	us-gaap	Valuation Allowances And Reserves Adjustments ValuationAllowancesAndReservesAdjustments	-6270000
CY2021Q4	us-gaap	Valuation Allowances And Reserves Balance ValuationAllowancesAndReservesBalance	16785000
CY2023	us-gaap	Number Of Reporting Units NumberOfReportingUnits	2
CY2022	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	0
CY2021	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	0
CY2023	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	0
CY2022	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	0
CY2023	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	0
CY2021	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	0
CY2023Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	0
CY2023	lstr	Dividends Payable Date Announced Day Month And Year DividendsPayableDateAnnouncedDayMonthAndYear	2023-12-04
CY2023Q4	us-gaap	Dividends Payable Amount Per Share DividendsPayableAmountPerShare	2
CY2023	us-gaap	Dividend Payable Date To Be Paid Day Month And Year DividendPayableDateToBePaidDayMonthAndYear	2024-01-19
CY2023	us-gaap	Dividends Payable Date Of Record Day Month And Year DividendsPayableDateOfRecordDayMonthAndYear	2024-01-03
CY2023Q4	us-gaap	Dividends Payable Current DividendsPayableCurrent	71433000
CY2022	lstr	Dividends Payable Date Announced Day Month And Year DividendsPayableDateAnnouncedDayMonthAndYear	2022-12-06
CY2022Q4	us-gaap	Dividends Payable Amount Per Share DividendsPayableAmountPerShare	2
CY2022	us-gaap	Dividend Payable Date To Be Paid Day Month And Year DividendPayableDateToBePaidDayMonthAndYear	2023-01-20
CY2022	us-gaap	Dividends Payable Date Of Record Day Month And Year DividendsPayableDateOfRecordDayMonthAndYear	2023-01-06
CY2022Q4	us-gaap	Dividends Payable Current DividendsPayableCurrent	71854000
CY2023	lstr	Investments Maximum Maturity Period InvestmentsMaximumMaturityPeriod	P5Y
CY2023Q4	us-gaap	Debt Securities Available For Sale Accumulated Gross Unrealized Gain Loss Before Tax DebtSecuritiesAvailableForSaleAccumulatedGrossUnrealizedGainLossBeforeTax	-6382000
CY2022Q4	us-gaap	Debt Securities Available For Sale Accumulated Gross Unrealized Gain Loss Before Tax DebtSecuritiesAvailableForSaleAccumulatedGrossUnrealizedGainLossBeforeTax	-10763000
CY2023Q4	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	158143000
CY2023Q4	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Gain Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax	281000
CY2023Q4	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Loss Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	6663000
CY2023Q4	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	151761000
CY2022Q4	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	169293000
CY2022Q4	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Gain Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax	1000
CY2022Q4	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Loss Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	10764000
CY2022Q4	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	158530000
CY2023Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months	3506000
CY2023Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss	42000
CY2023Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger	103453000
CY2023Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss	6621000
CY2023Q4	us-gaap	Debt Securities Available For Sale Unrealized Loss Position DebtSecuritiesAvailableForSaleUnrealizedLossPosition	106959000
CY2023Q4	us-gaap	Debt Securities Available For Sale Unrealized Loss Position Accumulated Loss DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss	6663000
CY2022Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months	56275000
CY2022Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss	1616000
CY2022Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger	78406000
CY2022Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss	9148000
CY2022Q4	us-gaap	Debt Securities Available For Sale Unrealized Loss Position DebtSecuritiesAvailableForSaleUnrealizedLossPosition	134681000
CY2022Q4	us-gaap	Debt Securities Available For Sale Unrealized Loss Position Accumulated Loss DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss	10764000
CY2023	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	76827000
CY2022	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	116642000
CY2021	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	104640000
CY2023	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	13305000
CY2022	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	23309000
CY2021	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	18462000
CY2023	us-gaap	Current Foreign Tax Expense Benefit CurrentForeignTaxExpenseBenefit	1278000
CY2022	us-gaap	Current Foreign Tax Expense Benefit CurrentForeignTaxExpenseBenefit	1958000
CY2021	us-gaap	Current Foreign Tax Expense Benefit CurrentForeignTaxExpenseBenefit	856000
CY2023	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	91410000
CY2022	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	141909000
CY2021	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	123958000
CY2023	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	-8410000
CY2022	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	-3945000
CY2021	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	-3278000
CY2023	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	701000
CY2022	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	-1415000
CY2021	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	-512000
CY2023	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-7709000
CY2022	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-5360000
CY2021	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-3790000
CY2023	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	83701000
CY2022	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	136549000
CY2021	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	120168000
CY2023Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Allowance For Doubtful Accounts DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts	6616000
CY2022Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Allowance For Doubtful Accounts DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts	5838000
CY2023Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Share Based Compensation Cost DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost	2550000
CY2022Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Share Based Compensation Cost DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost	5021000
CY2023Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Self Insurance DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsSelfInsurance	3376000
CY2022Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Self Insurance DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsSelfInsurance	3205000
CY2023Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	10412000
CY2022Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	11381000
CY2023Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	22954000
CY2022Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	25445000
CY2023Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	39117000
CY2022Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	49092000
CY2023Q4	us-gaap	Deferred Tax Liabilities Goodwill And Intangible Assets Goodwill DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsGoodwill	4107000
CY2022Q4	us-gaap	Deferred Tax Liabilities Goodwill And Intangible Assets Goodwill DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsGoodwill	3892000
CY2023Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	3718000
CY2022Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	3895000
CY2023Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	46942000
CY2022Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	56879000
CY2023Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	23988000
CY2022Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	31434000
CY2023	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.21
CY2023	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	73100000
CY2022	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	119167000
CY2021	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	105355000
CY2023	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	11250000
CY2022	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	16596000
CY2021	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	14260000
CY2023	lstr	Income Tax Reconciliation Nondeductible Expense Executive Compensation Cost IncomeTaxReconciliationNondeductibleExpenseExecutiveCompensationCost	2309000
CY2022	lstr	Income Tax Reconciliation Nondeductible Expense Executive Compensation Cost IncomeTaxReconciliationNondeductibleExpenseExecutiveCompensationCost	3552000
CY2021	lstr	Income Tax Reconciliation Nondeductible Expense Executive Compensation Cost IncomeTaxReconciliationNondeductibleExpenseExecutiveCompensationCost	2946000
CY2023	us-gaap	Income Tax Reconciliation Nondeductible Expense Meals And Entertainment IncomeTaxReconciliationNondeductibleExpenseMealsAndEntertainment	520000
CY2022	us-gaap	Income Tax Reconciliation Nondeductible Expense Meals And Entertainment IncomeTaxReconciliationNondeductibleExpenseMealsAndEntertainment	200000
CY2021	us-gaap	Income Tax Reconciliation Nondeductible Expense Meals And Entertainment IncomeTaxReconciliationNondeductibleExpenseMealsAndEntertainment	0
CY2023	us-gaap	Income Tax Reconciliation Nondeductible Expense Share Based Compensation Cost IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost	-2832000
CY2022	us-gaap	Income Tax Reconciliation Nondeductible Expense Share Based Compensation Cost IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost	-2958000
CY2021	us-gaap	Income Tax Reconciliation Nondeductible Expense Share Based Compensation Cost IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost	-1070000
CY2023	us-gaap	Income Tax Reconciliation Tax Credits Research IncomeTaxReconciliationTaxCreditsResearch	1672000
CY2022	us-gaap	Income Tax Reconciliation Tax Credits Research IncomeTaxReconciliationTaxCreditsResearch	1526000
CY2021	us-gaap	Income Tax Reconciliation Tax Credits Research IncomeTaxReconciliationTaxCreditsResearch	2069000
CY2023	us-gaap	Income Tax Reconciliation Other Reconciling Items IncomeTaxReconciliationOtherReconcilingItems	1026000
CY2022	us-gaap	Income Tax Reconciliation Other Reconciling Items IncomeTaxReconciliationOtherReconcilingItems	1518000
CY2021	us-gaap	Income Tax Reconciliation Other Reconciling Items IncomeTaxReconciliationOtherReconcilingItems	746000
CY2023	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	83701000
CY2022	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	136549000
CY2021	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	120168000
CY2023	lstr	Net Unrecognized Tax Benefits NetUnrecognizedTaxBenefits	4467000
CY2022	lstr	Net Unrecognized Tax Benefits NetUnrecognizedTaxBenefits	3046000
CY2023Q4	us-gaap	Unrecognized Tax Benefits Income Tax Penalties And Interest Accrued UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued	1249000
CY2022Q4	us-gaap	Unrecognized Tax Benefits Income Tax Penalties And Interest Accrued UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued	845000
CY2022Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	3726000
CY2021Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	2845000
CY2023	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	953000
CY2022	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	789000
CY2023	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	1570000
CY2022	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	792000
CY2023	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	0
CY2022	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	83000
CY2023	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	795000
CY2022	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	617000
CY2023Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	5454000
CY2022Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	3726000
CY2023	us-gaap	Income Taxes Paid IncomeTaxesPaid	92695000
CY2022	us-gaap	Income Taxes Paid IncomeTaxesPaid	158715000
CY2021	us-gaap	Income Taxes Paid IncomeTaxesPaid	104844000
CY2023Q4	us-gaap	Land Land	16328000
CY2022Q4	us-gaap	Land Land	16328000
CY2023Q4	us-gaap	Buildings And Improvements Gross BuildingsAndImprovementsGross	71157000
CY2022Q4	us-gaap	Buildings And Improvements Gross BuildingsAndImprovementsGross	69160000
CY2023Q4	lstr	Trailing Equipment Gross TrailingEquipmentGross	491208000
CY2022Q4	lstr	Trailing Equipment Gross TrailingEquipmentGross	502322000
CY2023Q4	lstr	Information Technology Hardware And Software Gross InformationTechnologyHardwareAndSoftwareGross	132153000
CY2022Q4	lstr	Information Technology Hardware And Software Gross InformationTechnologyHardwareAndSoftwareGross	110626000
CY2023Q4	us-gaap	Property Plant And Equipment Other PropertyPlantAndEquipmentOther	10136000
CY2022Q4	us-gaap	Property Plant And Equipment Other PropertyPlantAndEquipmentOther	9828000
CY2023Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	720982000
CY2022Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	708264000
CY2023Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	436682000
CY2022Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	393274000
CY2023Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	284300000
CY2022Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	314990000
CY2023Q4	lstr	Finance Leased Assets Gross FinanceLeasedAssetsGross	143542000
CY2022Q4	lstr	Finance Leased Assets Gross FinanceLeasedAssetsGross	185609000
CY2023Q4	lstr	Finance Leases Balance Sheet Assets By Major Class Net FinanceLeasesBalanceSheetAssetsByMajorClassNet	100188000
CY2022Q4	lstr	Finance Leases Balance Sheet Assets By Major Class Net FinanceLeasesBalanceSheetAssetsByMajorClassNet	137087000
CY2023	lstr	Finance Lease Obligations Incurred FinanceLeaseObligationsIncurred	4093000
CY2022	lstr	Finance Lease Obligations Incurred FinanceLeaseObligationsIncurred	30659000
CY2021	lstr	Finance Lease Obligations Incurred FinanceLeaseObligationsIncurred	48674000
CY2023	us-gaap	Defined Contribution Plan Maximum Annual Contributions Per Employee Percent DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent	0.75
CY2023	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	2812000
CY2022	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	2716000
CY2021	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	2374000
CY2022Q4	us-gaap	Long Term Debt LongTermDebt	0
CY2023Q4	us-gaap	Long Term Debt LongTermDebt	0
CY2023	us-gaap	Interest Paid InterestPaid	3604000
CY2022	us-gaap	Interest Paid InterestPaid	4151000
CY2021	us-gaap	Interest Paid InterestPaid	3715000
CY2023Q4	us-gaap	Lessee Finance Lease Term Of Contract1 LesseeFinanceLeaseTermOfContract1	P5Y
CY2023Q4	lstr	Finance Lease Option To Purchase Option Value FinanceLeaseOptionToPurchaseOptionValue	1
CY2023	us-gaap	Finance Lease Right Of Use Asset Amortization FinanceLeaseRightOfUseAssetAmortization	20258000
CY2023	us-gaap	Finance Lease Interest Expense FinanceLeaseInterestExpense	2598000
CY2023	lstr	Finance Lease Cost FinanceLeaseCost	22856000
CY2023	us-gaap	Operating Lease Cost OperatingLeaseCost	3603000
CY2023	us-gaap	Variable Lease Cost VariableLeaseCost	0
CY2023	us-gaap	Sublease Income SubleaseIncome	5456000
CY2023	lstr	Operating Leases Rent Income Expense Net OperatingLeasesRentIncomeExpenseNet	1853000
CY2023	us-gaap	Lease Cost LeaseCost	21003000
CY2022	lstr	Sublease Income Expense SubleaseIncomeExpense	2121000
CY2021	lstr	Sublease Income Expense SubleaseIncomeExpense	1632000
CY2023Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	1695000
CY2023Q4	us-gaap	Finance Lease Right Of Use Asset FinanceLeaseRightOfUseAsset	100188000
CY2023Q4	lstr	Lease Right Of Use Asset LeaseRightOfUseAsset	101883000
CY2023Q4	us-gaap	Finance Lease Liability Payments Due Next Twelve Months FinanceLeaseLiabilityPaymentsDueNextTwelveMonths	29739000
CY2023Q4	us-gaap	Lessee Operating Lease Liability Payments Due Next Twelve Months LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths	857000
CY2023Q4	us-gaap	Finance Lease Liability Payments Due Year Two FinanceLeaseLiabilityPaymentsDueYearTwo	23554000
CY2023Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Two LesseeOperatingLeaseLiabilityPaymentsDueYearTwo	544000
CY2023Q4	us-gaap	Finance Lease Liability Payments Due Year Three FinanceLeaseLiabilityPaymentsDueYearThree	15448000
CY2023Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Three LesseeOperatingLeaseLiabilityPaymentsDueYearThree	213000
CY2023Q4	us-gaap	Finance Lease Liability Payments Due Year Four FinanceLeaseLiabilityPaymentsDueYearFour	5049000
CY2023Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Four LesseeOperatingLeaseLiabilityPaymentsDueYearFour	176000
CY2023Q4	us-gaap	Finance Lease Liability Payments Due Year Five FinanceLeaseLiabilityPaymentsDueYearFive	948000
CY2023Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Five LesseeOperatingLeaseLiabilityPaymentsDueYearFive	49000
CY2023Q4	us-gaap	Finance Lease Liability Payments Due After Year Five FinanceLeaseLiabilityPaymentsDueAfterYearFive	0
CY2023Q4	us-gaap	Lessee Operating Lease Liability Payments Due After Year Five LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive	0
CY2023Q4	us-gaap	Finance Lease Liability Payments Due FinanceLeaseLiabilityPaymentsDue	74738000
CY2023Q4	us-gaap	Lessee Operating Lease Liability Payments Due LesseeOperatingLeaseLiabilityPaymentsDue	1839000
CY2023Q4	us-gaap	Finance Lease Liability Undiscounted Excess Amount FinanceLeaseLiabilityUndiscountedExcessAmount	3598000
CY2023Q4	us-gaap	Lessee Operating Lease Liability Undiscounted Excess Amount LesseeOperatingLeaseLiabilityUndiscountedExcessAmount	144000
CY2023Q4	us-gaap	Finance Lease Liability FinanceLeaseLiability	71140000
CY2023Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	1695000
CY2023Q4	us-gaap	Finance Lease Liability Current FinanceLeaseLiabilityCurrent	27876000
CY2023Q4	us-gaap	Finance Lease Liability Noncurrent FinanceLeaseLiabilityNoncurrent	43264000
CY2023Q4	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	832000
CY2023Q4	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	863000
CY2023Q4	us-gaap	Finance Lease Weighted Average Remaining Lease Term1 FinanceLeaseWeightedAverageRemainingLeaseTerm1	P2Y10M24D
CY2023Q4	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P2Y8M12D
CY2023	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Exercises In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice	56.4
CY2023Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	0
CY2023Q4	us-gaap	Finance Lease Weighted Average Discount Rate Percent FinanceLeaseWeightedAverageDiscountRatePercent	0.031
CY2023Q4	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.06
CY2023	us-gaap	Share Based Compensation ShareBasedCompensation	4282000
CY2022	us-gaap	Share Based Compensation ShareBasedCompensation	12399000
CY2021	us-gaap	Share Based Compensation ShareBasedCompensation	27537000
CY2023	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	3622000
CY2022	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	5199000
CY2021	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	7063000
CY2023	us-gaap	Allocated Share Based Compensation Expense Net Of Tax AllocatedShareBasedCompensationExpenseNetOfTax	660000
CY2022	us-gaap	Allocated Share Based Compensation Expense Net Of Tax AllocatedShareBasedCompensationExpenseNetOfTax	7200000
CY2021	us-gaap	Allocated Share Based Compensation Expense Net Of Tax AllocatedShareBasedCompensationExpenseNetOfTax	20474000
CY2023	us-gaap	Effective Income Tax Rate Reconciliation Share Based Compensation Excess Tax Benefit Amount EffectiveIncomeTaxRateReconciliationShareBasedCompensationExcessTaxBenefitAmount	2830000
CY2022	us-gaap	Effective Income Tax Rate Reconciliation Share Based Compensation Excess Tax Benefit Amount EffectiveIncomeTaxRateReconciliationShareBasedCompensationExcessTaxBenefitAmount	2948000
CY2021	us-gaap	Effective Income Tax Rate Reconciliation Share Based Compensation Excess Tax Benefit Amount EffectiveIncomeTaxRateReconciliationShareBasedCompensationExcessTaxBenefitAmount	1057000
CY2020Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	17650
CY2020Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	54.16
CY2020Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber	17650
CY2020Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice	54.16
CY2021	us-gaap	Stock Issued During Period Shares Stock Options Exercised StockIssuedDuringPeriodSharesStockOptionsExercised	9080
CY2021	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Exercises In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice	52.97
CY2021Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	8570
CY2020Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	17650
CY2020Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	54.16
CY2020Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber	17650
CY2020Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice	54.16
CY2021	us-gaap	Stock Issued During Period Shares Stock Options Exercised StockIssuedDuringPeriodSharesStockOptionsExercised	9080
CY2021	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Exercises In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice	52.97
CY2021Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	8570
CY2021Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	55.42
CY2021Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber	8570
CY2021Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice	55.42
CY2022	us-gaap	Stock Issued During Period Shares Stock Options Exercised StockIssuedDuringPeriodSharesStockOptionsExercised	6670
CY2022	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Exercises In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice	55.14
CY2022Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	1900
CY2022Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber	1900
CY2022Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice	56.4
CY2023	us-gaap	Stock Issued During Period Shares Stock Options Exercised StockIssuedDuringPeriodSharesStockOptionsExercised	1900
CY2023	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Exercises In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice	56.4
CY2023Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	0
CY2023Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber	0
CY2023Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	0
CY2021Q4	us-gaap	Stock Repurchase Program Number Of Shares Authorized To Be Repurchased StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased	1912824
CY2022Q4	us-gaap	Stock Repurchase Program Number Of Shares Authorized To Be Repurchased StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased	1900826
CY2023Q4	us-gaap	Stock Repurchase Program Number Of Shares Authorized To Be Repurchased StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased	319332
CY2023Q4	us-gaap	Stock Repurchase Program Remaining Number Of Shares Authorized To Be Repurchased StockRepurchaseProgramRemainingNumberOfSharesAuthorizedToBeRepurchased	3000000
CY2023Q4	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	2000000
CY2021	lstr	Number Of Customers Accounting For10 Percent Or More Of Revenue NumberOfCustomersAccountingFor10PercentOrMoreOfRevenue	0
CY2023	lstr	Number Of Customers Accounting For10 Percent Or More Of Revenue NumberOfCustomersAccountingFor10PercentOrMoreOfRevenue	0
CY2022	lstr	Entity Wide Revenue No Major Customer Accounted For Benchmark Percentage EntityWideRevenueNoMajorCustomerAccountedForBenchmarkPercentage	0.10
CY2021	lstr	Entity Wide Revenue No Major Customer Accounted For Benchmark Percentage EntityWideRevenueNoMajorCustomerAccountedForBenchmarkPercentage	0.10
CY2023	lstr	Entity Wide Revenue No Major Customer Accounted For Benchmark Percentage EntityWideRevenueNoMajorCustomerAccountedForBenchmarkPercentage	0.10
CY2023	us-gaap	Revenues Revenues	5303322000
CY2021Q4	us-gaap	Stock Repurchase Program Number Of Shares Authorized To Be Repurchased StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased	1912824
CY2022Q4	us-gaap	Stock Repurchase Program Number Of Shares Authorized To Be Repurchased StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased	1900826
CY2023Q4	us-gaap	Stock Repurchase Program Number Of Shares Authorized To Be Repurchased StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased	319332
CY2023Q4	us-gaap	Stock Repurchase Program Remaining Number Of Shares Authorized To Be Repurchased StockRepurchaseProgramRemainingNumberOfSharesAuthorizedToBeRepurchased	3000000
CY2023Q4	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	2000000
CY2023	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	5300000000
CY2023	us-gaap	Number Of Operating Segments NumberOfOperatingSegments	2
CY2022	lstr	Number Of Customers Accounting For10 Percent Or More Of Revenue NumberOfCustomersAccountingFor10PercentOrMoreOfRevenue	0
CY2021	lstr	Number Of Customers Accounting For10 Percent Or More Of Revenue NumberOfCustomersAccountingFor10PercentOrMoreOfRevenue	0
CY2023	lstr	Number Of Customers Accounting For10 Percent Or More Of Revenue NumberOfCustomersAccountingFor10PercentOrMoreOfRevenue	0
CY2022	lstr	Entity Wide Revenue No Major Customer Accounted For Benchmark Percentage EntityWideRevenueNoMajorCustomerAccountedForBenchmarkPercentage	0.10
CY2021	lstr	Entity Wide Revenue No Major Customer Accounted For Benchmark Percentage EntityWideRevenueNoMajorCustomerAccountedForBenchmarkPercentage	0.10
CY2023	lstr	Entity Wide Revenue No Major Customer Accounted For Benchmark Percentage EntityWideRevenueNoMajorCustomerAccountedForBenchmarkPercentage	0.10
CY2023	us-gaap	Revenues Revenues	5303322000
CY2023	us-gaap	Interest Income Operating InterestIncomeOperating	10141000
CY2023	lstr	Interest And Debt Income Expense InterestAndDebtIncomeExpense	-3946000
CY2023	us-gaap	Depreciation And Amortization DepreciationAndAmortization	58153000
CY2023	us-gaap	Operating Income Loss OperatingIncomeLoss	344149000
CY2023	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	25688000
CY2023Q4	us-gaap	Goodwill Goodwill	42275000
CY2023	lstr	Finance Lease Obligations Incurred FinanceLeaseObligationsIncurred	4093000
CY2023Q4	us-gaap	Assets Assets	1801846000
CY2022	us-gaap	Revenues Revenues	7436562000
CY2022	us-gaap	Interest Income Operating InterestIncomeOperating	3162000
CY2022	lstr	Interest And Debt Income Expense InterestAndDebtIncomeExpense	3620000
CY2022	us-gaap	Depreciation And Amortization DepreciationAndAmortization	57453000
CY2022	us-gaap	Operating Income Loss OperatingIncomeLoss	571083000
CY2022	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	26005000
CY2022Q4	us-gaap	Goodwill Goodwill	41220000
CY2022	lstr	Finance Lease Obligations Incurred FinanceLeaseObligationsIncurred	30659000
CY2022Q4	us-gaap	Assets Assets	1931879000
CY2021	us-gaap	Revenues Revenues	6537568000
CY2021	us-gaap	Interest Income Operating InterestIncomeOperating	2857000
CY2021	lstr	Interest And Debt Income Expense InterestAndDebtIncomeExpense	3976000
CY2023	us-gaap	Interest Income Operating InterestIncomeOperating	10141000
CY2023	lstr	Interest And Debt Income Expense InterestAndDebtIncomeExpense	-3946000
CY2023	us-gaap	Depreciation And Amortization DepreciationAndAmortization	58153000
CY2023	us-gaap	Operating Income Loss OperatingIncomeLoss	344149000
CY2023	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	25688000
CY2023Q4	us-gaap	Goodwill Goodwill	42275000
CY2023	lstr	Finance Lease Obligations Incurred FinanceLeaseObligationsIncurred	4093000
CY2023Q4	us-gaap	Assets Assets	1801846000
CY2022	us-gaap	Revenues Revenues	7436562000
CY2022	us-gaap	Interest Income Operating InterestIncomeOperating	3162000
CY2022	lstr	Interest And Debt Income Expense InterestAndDebtIncomeExpense	3620000
CY2022	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	26005000
CY2022	lstr	Finance Lease Obligations Incurred FinanceLeaseObligationsIncurred	30659000
CY2022Q4	us-gaap	Assets Assets	1931879000
CY2021	us-gaap	Revenues Revenues	6537568000
CY2021	us-gaap	Interest Income Operating InterestIncomeOperating	2857000
CY2021	lstr	Interest And Debt Income Expense InterestAndDebtIncomeExpense	3976000
CY2021	us-gaap	Depreciation And Amortization DepreciationAndAmortization	49609000
CY2021	us-gaap	Operating Income Loss OperatingIncomeLoss	505668000
CY2021	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	23261000
CY2021Q4	us-gaap	Goodwill Goodwill	40768000
CY2021	lstr	Finance Lease Obligations Incurred FinanceLeaseObligationsIncurred	48674000
CY2021Q4	us-gaap	Assets Assets	2045465000
CY2023	dei	Auditor Name AuditorName	KPMG LLP
CY2023	dei	Auditor Location AuditorLocation	Jacksonville, Florida
CY2023	dei	Auditor Firm AuditorFirmId	185
CY2023	ecd	Non Rule10b51 Arr Adopted Flag NonRule10b51ArrAdoptedFlag	false
CY2023	ecd	Rule10b51 Arr Trmntd Flag Rule10b51ArrTrmntdFlag	false
CY2021	us-gaap	Depreciation And Amortization DepreciationAndAmortization	49609000
CY2021	us-gaap	Operating Income Loss OperatingIncomeLoss	505668000
CY2021	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	23261000
CY2021Q4	us-gaap	Goodwill Goodwill	40768000
CY2021	lstr	Finance Lease Obligations Incurred FinanceLeaseObligationsIncurred	48674000
CY2021Q4	us-gaap	Assets Assets	2045465000
CY2023	dei	Auditor Name AuditorName	KPMG LLP
CY2023	dei	Auditor Location AuditorLocation	Jacksonville, Florida
CY2023	dei	Auditor Firm AuditorFirmId	185
CY2023	ecd	Non Rule10b51 Arr Adopted Flag NonRule10b51ArrAdoptedFlag	false
CY2023	ecd	Rule10b51 Arr Trmntd Flag Rule10b51ArrTrmntdFlag	false
CY2023	ecd	Non Rule10b51 Arr Trmntd Flag NonRule10b51ArrTrmntdFlag	false
CY2023	ecd	Rule10b51 Arr Adopted Flag Rule10b51ArrAdoptedFlag	false
CY2023	ecd	Non Rule10b51 Arr Trmntd Flag NonRule10b51ArrTrmntdFlag	false
CY2023	ecd	Rule10b51 Arr Adopted Flag Rule10b51ArrAdoptedFlag	false

Files In Submission

Name	View Source	Status
FilingSummary.xml	Edgar Link	unprocessable
lstr-20231230_cal.xml	Edgar Link	unprocessable
0001193125-24-044902-index-headers.html	Edgar Link	pending
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0001193125-24-044902.txt	Edgar Link	pending
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d16653dex321.htm	Edgar Link	pending
d16653dex322.htm	Edgar Link	pending
d16653dex971.htm	Edgar Link	pending
Financial_Report.xlsx	Edgar Link	pending
g16653g0201215047363.jpg	Edgar Link	pending
g16653g0201215047849.jpg	Edgar Link	pending
lstr-20231230.xsd	Edgar Link	pending
MetaLinks.json	Edgar Link	pending
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R10.htm	Edgar Link	pending
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R17.htm	Edgar Link	pending
R18.htm	Edgar Link	pending
R19.htm	Edgar Link	pending
R2.htm	Edgar Link	pending
lstr-20231230_def.xml	Edgar Link	unprocessable
lstr-20231230_lab.xml	Edgar Link	unprocessable
lstr-20231230_pre.xml	Edgar Link	unprocessable
d16653d10k_htm.xml	Edgar Link	completed
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R69.htm	Edgar Link	pending
R7.htm	Edgar Link	pending
R8.htm	Edgar Link	pending
R9.htm	Edgar Link	pending
report.css	Edgar Link	pending
Show.js	Edgar Link	pending

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$LSTR
LANDSTAR SYSTEM INC Stock $lstr

2024 Q1 Form 10-K Financial Statement

#000119312524044902 Filed on February 26, 2024

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$LSTR LANDSTAR SYSTEM INC Stock $lstr

2024 Q1 Form 10-K Financial Statement

#000119312524044902 Filed on February 26, 2024

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$LSTR
LANDSTAR SYSTEM INC Stock $lstr