$TDW
TIDEWATER INC Stock $tdw

$tdw Overview Financials Valuation SEC Filings Company Website

2021 Q4 Form 10-K Financial Statement

#000143774922005725 Filed on March 09, 2022

Income Statement

Concept	2021 Q4	2021	2020 Q4
Revenue	$105.2M	$371.0M	$91.90M
YoY Change	14.45%	-6.55%	-22.63%
Cost Of Revenue	$71.42M	$264.0M	$63.70M
YoY Change	12.11%	-3.0%	-26.7%
Gross Profit	$33.76M	$107.0M	$28.10M
YoY Change	20.14%	-460.59%	-11.91%
Gross Profit Margin	32.1%	28.84%	30.58%
Selling, General & Admin	$17.46M	$68.17M	$11.00M
YoY Change	58.72%	3.13%	-48.84%
% of Gross Profit	51.72%	63.72%	39.15%
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$18.62M	$73.22M	$19.40M
YoY Change	-4.03%	0.26%	0.0%
% of Gross Profit	55.15%	68.44%	69.04%
Operating Expenses	$45.75M	$182.7M	$41.70M
YoY Change	9.71%	-0.05%	-16.1%
Operating Profit	-$11.99M	-$95.02M	-$13.60M
YoY Change	-11.86%	-49.14%	-72.82%
Interest Expense	-$3.034M	$1.605M	-$8.600M
YoY Change	-64.72%	30.7%	-7.53%
% of Operating Profit
Other Income/Expense, Net		-$28.77M
YoY Change		164.93%
Pretax Income	-$41.13M	-$123.8M	-$33.90M
YoY Change	21.32%	-37.38%	-42.83%
Income Tax	-$3.047M	$5.875M	-$4.500M
% Of Pretax Income
Net Earnings	-$37.93M	-$129.0M	-$29.20M
YoY Change	29.91%	-34.28%	-51.21%
Net Earnings / Revenue	-36.07%	-34.76%	-31.77%
Basic Earnings Per Share		-$3.14
Diluted Earnings Per Share	-$918.9K	-$3.14	-$719.2K
COMMON SHARES
Basic Shares Outstanding	41.28M	41.01M	40.55M
Diluted Shares Outstanding		41.01M

Balance Sheet

Concept	2021 Q4	2021	2020 Q4
SHORT-TERM ASSETS
Cash & Short-Term Investments	$149.0M	$149.0M	$149.9M
YoY Change	-0.58%	-0.58%	-31.33%
Cash & Equivalents	$149.0M	$149.0M	$149.9M
Short-Term Investments
Other Short-Term Assets	$24.39M	$24.39M	$48.20M
YoY Change	-49.39%	-49.39%	-20.98%
Inventory	$12.61M	$12.61M	$15.90M
Prepaid Expenses
Receivables	$86.50M	$86.50M	$112.6M
Other Receivables	$70.13M	$70.13M	$62.10M
Total Short-Term Assets	$342.7M	$342.7M	$388.6M
YoY Change	-11.83%	-11.82%	-27.67%
LONG-TERM ASSETS
Property, Plant & Equipment	$688.0M	$691.5M	$780.3M
YoY Change	-11.83%	-11.77%	0.0%
Goodwill
YoY Change
Intangibles
YoY Change
Long-Term Investments			$0.00
YoY Change
Other Assets	$24.33M	$61.63M	$25.74M
YoY Change	-5.47%	-21.79%	-29.15%
Total Long-Term Assets	$753.1M	$753.1M	$862.5M
YoY Change	-12.69%	-12.69%	-17.24%
TOTAL ASSETS
Total Short-Term Assets	$342.7M	$342.7M	$388.6M
Total Long-Term Assets	$753.1M	$753.1M	$862.5M
Total Assets	$1.096B	$1.096B	$1.251B
YoY Change	-12.42%	-12.42%	-20.79%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$20.79M	$20.79M	$16.98M
YoY Change	22.42%	22.28%	-38.25%
Accrued Expenses	$51.73M	$53.14M	$52.42M
YoY Change	-1.31%	-0.86%	-29.16%
Deferred Revenue
YoY Change
Short-Term Debt	$0.00	$0.00	$0.00
YoY Change
Long-Term Debt Due	$0.00	$0.00	$27.80M
YoY Change	-100.0%	-100.0%	181.06%
Total Short-Term Liabilities	$157.9M	$157.9M	$183.2M
YoY Change	-13.78%	-13.79%	-1.35%
LONG-TERM LIABILITIES
Long-Term Debt	$167.9M	$167.9M	$164.9M
YoY Change	1.79%	1.81%	-40.89%
Other Long-Term Liabilities	$68.18M	$68.18M	$79.79M
YoY Change	-14.55%	-14.56%	-18.91%
Total Long-Term Liabilities	$236.1M	$236.1M	$244.7M
YoY Change	-3.54%	-3.53%	-35.16%
TOTAL LIABILITIES
Total Short-Term Liabilities	$157.9M	$157.9M	$183.2M
Total Long-Term Liabilities	$236.1M	$236.1M	$244.7M
Total Liabilities	$394.0M	$394.5M	$427.9M
YoY Change	-7.92%	-8.07%	-24.01%
SHAREHOLDERS EQUITY
Retained Earnings	-$677.9M		-$548.9M
YoY Change	23.49%		55.71%
Common Stock	$1.377B		$1.372B
YoY Change	0.34%		0.31%
Preferred Stock
YoY Change
Treasury Stock (at cost)
YoY Change
Treasury Stock Shares
Shareholders Equity	$701.3M	$701.3M	$822.1M
YoY Change
Total Liabilities & Shareholders Equity	$1.096B	$1.096B	$1.251B
YoY Change	-12.42%	-12.42%	-20.79%

Cashflow Statement

Concept	2021 Q4	2021	2020 Q4
OPERATING ACTIVITIES
Net Income	-$37.93M	-$129.0M	-$29.20M
YoY Change	29.91%	-34.28%	-51.21%
Depreciation, Depletion And Amortization	$18.62M	$73.22M	$19.40M
YoY Change	-4.03%	0.26%	0.0%
Cash From Operating Activities	$6.938M	$15.01M	$2.200M
YoY Change	215.36%	276.47%	-58.49%
INVESTING ACTIVITIES
Capital Expenditures	-$6.368M	$8.951M	-$10.20M
YoY Change	-37.57%	-39.93%	148.78%
Acquisitions		$0.00
YoY Change
Other Investing Activities	$54.00K	$34.01M	$6.800M
YoY Change	-99.21%	-11.2%	83.78%
Cash From Investing Activities	-$6.314M	$25.06M	-$3.400M
YoY Change	85.71%	7.11%	750.0%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net
YoY Change
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	-48.00K	-$41.01M	-65.60M
YoY Change	-99.93%	-58.89%	-53.14%
NET CHANGE
Cash From Operating Activities	6.938M	$15.01M	2.200M
Cash From Investing Activities	-6.314M	$25.06M	-3.400M
Cash From Financing Activities	-48.00K	-$41.01M	-65.60M
Net Change In Cash	576.0K	-$949.0K	-66.80M
YoY Change	-100.86%	-98.69%	-50.56%
FREE CASH FLOW
Cash From Operating Activities	$6.938M	$15.01M	$2.200M
Capital Expenditures	-$6.368M	$8.951M	-$10.20M
Free Cash Flow	$13.31M	$6.055M	$12.40M
YoY Change	7.31%	-155.48%	31.91%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
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CY2020Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	71800000	USD
CY2021Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2020Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2021Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.001
CY2020Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.001
CY2021Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	125000000
CY2020Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	125000000
CY2021Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	41307617
CY2021Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	41307617
CY2020Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	40704984
CY2020Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	40704984
CY2021	tdw	Other Comprehensive Income Supplemental Executive Retirement Plan Minimum Liability Adjustment Tax Period Increase Decrease OtherComprehensiveIncomeSupplementalExecutiveRetirementPlanMinimumLiabilityAdjustmentTaxPeriodIncreaseDecrease	0	USD
CY2019	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	0	USD
CY2020	tdw	Other Comprehensive Income Supplemental Executive Retirement Plan Minimum Liability Adjustment Tax Period Increase Decrease OtherComprehensiveIncomeSupplementalExecutiveRetirementPlanMinimumLiabilityAdjustmentTaxPeriodIncreaseDecrease	0	USD
CY2019	tdw	Other Comprehensive Income Supplemental Executive Retirement Plan Minimum Liability Adjustment Tax Period Increase Decrease OtherComprehensiveIncomeSupplementalExecutiveRetirementPlanMinimumLiabilityAdjustmentTaxPeriodIncreaseDecrease	0	USD
CY2021	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax	0	USD
CY2020	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax	0	USD
CY2019	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax	0	USD
CY2021	tdw	Highly Liquid Investments Maturity Period HighlyLiquidInvestmentsMaturityPeriod	P3Y
CY2021	tdw	Inspection Interval InspectionInterval	P5Y
CY2020	tdw	Number Of Vessels Transfer From Held For Sale To Active Fleet NumberOfVesselsTransferFromHeldForSaleToActiveFleet	2	pure
CY2021Q4	us-gaap	Defined Benefit Plan Expected Amortization Of Prior Service Cost Credit Next Fiscal Year DefinedBenefitPlanExpectedAmortizationOfPriorServiceCostCreditNextFiscalYear	0	USD
CY2021Q4	us-gaap	Preferred Stock No Par Value PreferredStockNoParValue	0
CY2020Q4	us-gaap	Preferred Stock No Par Value PreferredStockNoParValue	0
CY2020	us-gaap	Stock Repurchased During Period Shares StockRepurchasedDuringPeriodShares	0
CY2019	us-gaap	Stock Repurchased During Period Shares StockRepurchasedDuringPeriodShares	0
CY2020	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	0	USD
CY2021Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	149037000	USD
CY2020Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	149933000	USD
CY2021Q4	us-gaap	Restricted Cash Current RestrictedCashCurrent	1240000	USD
CY2020Q4	us-gaap	Restricted Cash Current RestrictedCashCurrent	2079000	USD
CY2021Q4	us-gaap	Accounts And Other Receivables Net Current AccountsAndOtherReceivablesNetCurrent	86503000	USD
CY2020Q4	us-gaap	Accounts And Other Receivables Net Current AccountsAndOtherReceivablesNetCurrent	112623000	USD
CY2021Q4	us-gaap	Due From Affiliate Current DueFromAffiliateCurrent	70134000	USD
CY2020Q4	us-gaap	Due From Affiliate Current DueFromAffiliateCurrent	62050000	USD
CY2021Q4	us-gaap	Supplies Supplies	12606000	USD
CY2020Q4	us-gaap	Supplies Supplies	15876000	USD
CY2021Q4	us-gaap	Assets Held For Sale Not Part Of Disposal Group Current AssetsHeldForSaleNotPartOfDisposalGroupCurrent	14421000	USD
CY2020Q4	us-gaap	Assets Held For Sale Not Part Of Disposal Group Current AssetsHeldForSaleNotPartOfDisposalGroupCurrent	34396000	USD
CY2021Q4	us-gaap	Prepaid Expense And Other Assets Current PrepaidExpenseAndOtherAssetsCurrent	8731000	USD
CY2020Q4	us-gaap	Prepaid Expense And Other Assets Current PrepaidExpenseAndOtherAssetsCurrent	11692000	USD
CY2021Q4	us-gaap	Assets Current AssetsCurrent	342672000	USD
CY2020Q4	us-gaap	Assets Current AssetsCurrent	388649000	USD
CY2021Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	688040000	USD
CY2020Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	780318000	USD
CY2021Q4	us-gaap	Deferred Costs DeferredCosts	40734000	USD
CY2020Q4	us-gaap	Deferred Costs DeferredCosts	56468000	USD
CY2021Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	24334000	USD
CY2020Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	25742000	USD
CY2021Q4	us-gaap	Assets Assets	1095780000	USD
CY2020Q4	us-gaap	Assets Assets	1251177000	USD
CY2021Q4	us-gaap	Accounts Payable Current AccountsPayableCurrent	20788000	USD
CY2020Q4	us-gaap	Accounts Payable Current AccountsPayableCurrent	16981000	USD
CY2021Q4	us-gaap	Accrued Liabilities Current AccruedLiabilitiesCurrent	51734000	USD
CY2020Q4	us-gaap	Accrued Liabilities Current AccruedLiabilitiesCurrent	52422000	USD
CY2021Q4	us-gaap	Due To Affiliate Current DueToAffiliateCurrent	61555000	USD
CY2020Q4	us-gaap	Due To Affiliate Current DueToAffiliateCurrent	53194000	USD
CY2021Q4	us-gaap	Long Term Debt Current LongTermDebtCurrent	0	USD
CY2020Q4	us-gaap	Long Term Debt Current LongTermDebtCurrent	27797000	USD
CY2021Q4	us-gaap	Other Liabilities Current OtherLiabilitiesCurrent	23865000	USD
CY2020Q4	us-gaap	Other Liabilities Current OtherLiabilitiesCurrent	32785000	USD
CY2021Q4	us-gaap	Liabilities Current LiabilitiesCurrent	157942000	USD
CY2020Q4	us-gaap	Liabilities Current LiabilitiesCurrent	183179000	USD
CY2021Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	167885000	USD
CY2020Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	164934000	USD
CY2021Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	68184000	USD
CY2020Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	79792000	USD
CY2021Q4	us-gaap	Common Stock Value CommonStockValue	41000	USD
CY2020Q4	us-gaap	Common Stock Value CommonStockValue	41000	USD
CY2021Q4	us-gaap	Additional Paid In Capital Common Stock AdditionalPaidInCapitalCommonStock	1376494000	USD
CY2020Q4	us-gaap	Additional Paid In Capital Common Stock AdditionalPaidInCapitalCommonStock	1371809000	USD
CY2021Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	-677900000	USD
CY2020Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	-548931000	USD
CY2021Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	2668000	USD
CY2020Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-804000	USD
CY2021Q4	us-gaap	Stockholders Equity StockholdersEquity	701303000	USD
CY2020Q4	us-gaap	Stockholders Equity StockholdersEquity	822115000	USD
CY2021Q4	us-gaap	Minority Interest MinorityInterest	466000	USD
CY2020Q4	us-gaap	Minority Interest MinorityInterest	1157000	USD
CY2021Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	701769000	USD
CY2020Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	823272000	USD
CY2021Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	1095780000	USD
CY2020Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	1251177000	USD
CY2021	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	371033000	USD
CY2020	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	397038000	USD
CY2019	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	486549000	USD
CY2021	us-gaap	Direct Operating Costs DirectOperatingCosts	261814000	USD
CY2020	us-gaap	Direct Operating Costs DirectOperatingCosts	268780000	USD
CY2019	us-gaap	Direct Operating Costs DirectOperatingCosts	329196000	USD
CY2021	us-gaap	Other Cost Of Operating Revenue OtherCostOfOperatingRevenue	2231000	USD
CY2020	us-gaap	Other Cost Of Operating Revenue OtherCostOfOperatingRevenue	3405000	USD
CY2019	us-gaap	Other Cost Of Operating Revenue OtherCostOfOperatingRevenue	2800000	USD
CY2021	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	68516000	USD
CY2020	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	73447000	USD
CY2019	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	103716000	USD
CY2021	us-gaap	Depreciation And Amortization DepreciationAndAmortization	114544000	USD
CY2020	us-gaap	Depreciation And Amortization DepreciationAndAmortization	116709000	USD
CY2019	us-gaap	Depreciation And Amortization DepreciationAndAmortization	101931000	USD
CY2021	us-gaap	Gain Loss On Disposition Of Assets1 GainLossOnDispositionOfAssets1	-2901000	USD
CY2020	us-gaap	Gain Loss On Disposition Of Assets1 GainLossOnDispositionOfAssets1	7591000	USD
CY2019	us-gaap	Gain Loss On Disposition Of Assets1 GainLossOnDispositionOfAssets1	2263000	USD
CY2021	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	400000	USD
CY2020	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	52981000	USD
CY2019	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	0	USD
CY2021	us-gaap	Affiliate Costs AffiliateCosts	0	USD
CY2020	us-gaap	Affiliate Costs AffiliateCosts	2000000	USD
CY2019	us-gaap	Affiliate Costs AffiliateCosts	0	USD
CY2021	us-gaap	Asset Impairment Charges AssetImpairmentCharges	15643000	USD
CY2020	us-gaap	Asset Impairment Charges AssetImpairmentCharges	74109000	USD
CY2019	us-gaap	Asset Impairment Charges AssetImpairmentCharges	37773000	USD
CY2021	us-gaap	Costs And Expenses CostsAndExpenses	466049000	USD
CY2020	us-gaap	Costs And Expenses CostsAndExpenses	583840000	USD
CY2019	us-gaap	Costs And Expenses CostsAndExpenses	573153000	USD
CY2021	us-gaap	Operating Income Loss OperatingIncomeLoss	-95016000	USD
CY2020	us-gaap	Operating Income Loss OperatingIncomeLoss	-186802000	USD
CY2019	us-gaap	Operating Income Loss OperatingIncomeLoss	-86604000	USD
CY2021	us-gaap	Foreign Currency Transaction Gain Loss Before Tax ForeignCurrencyTransactionGainLossBeforeTax	-369000	USD
CY2020	us-gaap	Foreign Currency Transaction Gain Loss Before Tax ForeignCurrencyTransactionGainLossBeforeTax	-5245000	USD
CY2020	tdw	Other Comprehensive Income Supplemental Executive Retirement Plan Minimum Liability Adjustment Net Of Tax Period Increase Decrease OtherComprehensiveIncomeSupplementalExecutiveRetirementPlanMinimumLiabilityAdjustmentNetOfTaxPeriodIncreaseDecrease	-2309000	USD
CY2019	tdw	Other Comprehensive Income Supplemental Executive Retirement Plan Minimum Liability Adjustment Net Of Tax Period Increase Decrease OtherComprehensiveIncomeSupplementalExecutiveRetirementPlanMinimumLiabilityAdjustmentNetOfTaxPeriodIncreaseDecrease	-2121000	USD
CY2021	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	-4235000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	-1741000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	309000	USD
CY2019	us-gaap	Foreign Currency Transaction Gain Loss Before Tax ForeignCurrencyTransactionGainLossBeforeTax	-1269000	USD
CY2021	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	-3322000	USD
CY2020	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	164000	USD
CY2019	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	-3152000	USD
CY2021	us-gaap	Investment Income Dividend InvestmentIncomeDividend	0	USD
CY2020	us-gaap	Investment Income Dividend InvestmentIncomeDividend	17150000	USD
CY2019	us-gaap	Investment Income Dividend InvestmentIncomeDividend	0	USD
CY2021	us-gaap	Interest Income Expense Nonoperating Net InterestIncomeExpenseNonoperatingNet	1605000	USD
CY2020	us-gaap	Interest Income Expense Nonoperating Net InterestIncomeExpenseNonoperatingNet	1228000	USD
CY2019	us-gaap	Interest Income Expense Nonoperating Net InterestIncomeExpenseNonoperatingNet	6598000	USD
CY2021	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	-11100000	USD
CY2020	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	0	USD
CY2019	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	0	USD
CY2021	tdw	Interest And Other Debt Costs Net InterestAndOtherDebtCostsNet	15583000	USD
CY2020	tdw	Interest And Other Debt Costs Net InterestAndOtherDebtCostsNet	24156000	USD
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CY2021	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	-28769000	USD
CY2020	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	-10859000	USD
CY2019	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	-26891000	USD
CY2021	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	-123785000	USD
CY2020	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	-197661000	USD
CY2019	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	-113495000	USD
CY2021	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	5875000	USD
CY2020	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-965000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	27724000	USD
CY2021	us-gaap	Profit Loss ProfitLoss	-129660000	USD
CY2020	us-gaap	Profit Loss ProfitLoss	-196696000	USD
CY2019	us-gaap	Profit Loss ProfitLoss	-141219000	USD
CY2021	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	-691000	USD
CY2020	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	-454000	USD
CY2019	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	524000	USD
CY2021	us-gaap	Net Income Loss NetIncomeLoss	-128969000	USD
CY2020	us-gaap	Net Income Loss NetIncomeLoss	-196242000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	-141743000	USD
CY2021	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-3.14
CY2020	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-4.86
CY2019	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-3.71
CY2021	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-3.14
CY2020	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-4.86
CY2019	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-3.71
CY2021	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	41008907
CY2020	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	40354638
CY2019	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	38204934
CY2021	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	0
CY2020	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	0
CY2019	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	0
CY2021	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	41008907
CY2020	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	40354638
CY2019	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	38204934
CY2021	us-gaap	Profit Loss ProfitLoss	-129660000	USD
CY2020	us-gaap	Profit Loss ProfitLoss	-196696000	USD
CY2019	us-gaap	Profit Loss ProfitLoss	-141219000	USD
CY2021	tdw	Other Comprehensive Income Supplemental Executive Retirement Plan Minimum Liability Adjustment Net Of Tax Period Increase Decrease OtherComprehensiveIncomeSupplementalExecutiveRetirementPlanMinimumLiabilityAdjustmentNetOfTaxPeriodIncreaseDecrease	-763000	USD
CY2020	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	-197264000	USD
CY2020	tdw	Stock Issued During Period Value Warrant Exercises StockIssuedDuringPeriodValueWarrantExercises	0	USD
CY2020	tdw	Stock Issued During Period Value Amortization Or Cancellation Of Restricted Stock StockIssuedDuringPeriodValueAmortizationOrCancellationOfRestrictedStock	4289000	USD
CY2020Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	823272000	USD
CY2021	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	-126188000	USD
CY2021	tdw	Stock Issued During Period Value Amortization Or Cancellation Of Restricted Stock StockIssuedDuringPeriodValueAmortizationOrCancellationOfRestrictedStock	4685000	USD
CY2021	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	-126188000	USD
CY2020	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	-197264000	USD
CY2021Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	701769000	USD
CY2021	us-gaap	Profit Loss ProfitLoss	-129660000	USD
CY2020	us-gaap	Profit Loss ProfitLoss	-196696000	USD
CY2019	us-gaap	Profit Loss ProfitLoss	-141219000	USD
CY2021	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	73223000	USD
CY2020	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	73030000	USD
CY2019	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	77045000	USD
CY2021	tdw	Amortization Of Dry Docking And Survey Costs AmortizationOfDryDockingAndSurveyCosts	41321000	USD
CY2020	tdw	Amortization Of Dry Docking And Survey Costs AmortizationOfDryDockingAndSurveyCosts	43679000	USD
CY2019	tdw	Amortization Of Dry Docking And Survey Costs AmortizationOfDryDockingAndSurveyCosts	24886000	USD
CY2019	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	-143649000	USD
CY2018Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	1144923000	USD
CY2019	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	-143649000	USD
CY2019	tdw	Stock Issued During Period Value Warrant Exercises StockIssuedDuringPeriodValueWarrantExercises	0	USD
CY2019	tdw	Stock Issued During Period Value Amortization Or Cancellation Of Restricted Stock StockIssuedDuringPeriodValueAmortizationOrCancellationOfRestrictedStock	15136000	USD
CY2019Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	1016410000	USD
CY2021	us-gaap	Amortization Of Debt Discount Premium AmortizationOfDebtDiscountPremium	3171000	USD
CY2020	us-gaap	Amortization Of Debt Discount Premium AmortizationOfDebtDiscountPremium	3961000	USD
CY2019	us-gaap	Amortization Of Debt Discount Premium AmortizationOfDebtDiscountPremium	-4877000	USD
CY2021	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-1287000	USD
CY2020	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	1224000	USD
CY2019	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	672000	USD
CY2021	us-gaap	Gain Loss On Disposition Of Assets GainLossOnDispositionOfAssets	-2901000	USD
CY2020	us-gaap	Gain Loss On Disposition Of Assets GainLossOnDispositionOfAssets	7591000	USD
CY2019	us-gaap	Gain Loss On Disposition Of Assets GainLossOnDispositionOfAssets	2263000	USD
CY2021	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	400000	USD
CY2020	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	52981000	USD
CY2019	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	0	USD
CY2021	us-gaap	Affiliate Costs AffiliateCosts	0	USD
CY2020	us-gaap	Affiliate Costs AffiliateCosts	2000000	USD
CY2019	us-gaap	Affiliate Costs AffiliateCosts	0	USD
CY2021	us-gaap	Asset Impairment Charges AssetImpairmentCharges	15643000	USD
CY2020	us-gaap	Asset Impairment Charges AssetImpairmentCharges	74109000	USD
CY2019	us-gaap	Asset Impairment Charges AssetImpairmentCharges	37773000	USD
CY2021	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	-11100000	USD
CY2020	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	-0	USD
CY2019	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	-0	USD
CY2021	us-gaap	Income Loss From Equity Method Investments Net Of Dividends Or Distributions IncomeLossFromEquityMethodInvestmentsNetOfDividendsOrDistributions	-0	USD
CY2020	us-gaap	Income Loss From Equity Method Investments Net Of Dividends Or Distributions IncomeLossFromEquityMethodInvestmentsNetOfDividendsOrDistributions	-0	USD
CY2019	us-gaap	Income Loss From Equity Method Investments Net Of Dividends Or Distributions IncomeLossFromEquityMethodInvestmentsNetOfDividendsOrDistributions	-1039000	USD
CY2021	us-gaap	Share Based Compensation ShareBasedCompensation	5638000	USD
CY2020	us-gaap	Share Based Compensation ShareBasedCompensation	5117000	USD
CY2019	us-gaap	Share Based Compensation ShareBasedCompensation	19603000	USD
CY2021	us-gaap	Increase Decrease In Accounts And Other Receivables IncreaseDecreaseInAccountsAndOtherReceivables	-26120000	USD
CY2020	us-gaap	Increase Decrease In Accounts And Other Receivables IncreaseDecreaseInAccountsAndOtherReceivables	2606000	USD
CY2019	us-gaap	Increase Decrease In Accounts And Other Receivables IncreaseDecreaseInAccountsAndOtherReceivables	-1086000	USD
CY2021	us-gaap	Increase Decrease In Due To Affiliates IncreaseDecreaseInDueToAffiliates	-123000	USD
CY2020	us-gaap	Increase Decrease In Due To Affiliates IncreaseDecreaseInDueToAffiliates	11949000	USD
CY2019	us-gaap	Increase Decrease In Due To Affiliates IncreaseDecreaseInDueToAffiliates	22193000	USD
CY2021	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	-1365000	USD
CY2020	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	-2588000	USD
CY2019	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	-2425000	USD
CY2021	us-gaap	Increase Decrease In Other Current Assets IncreaseDecreaseInOtherCurrentAssets	-2961000	USD
CY2020	us-gaap	Increase Decrease In Other Current Assets IncreaseDecreaseInOtherCurrentAssets	-4264000	USD
CY2019	us-gaap	Increase Decrease In Other Current Assets IncreaseDecreaseInOtherCurrentAssets	4120000	USD
CY2021	us-gaap	Increase Decrease In Accounts Payable Trade IncreaseDecreaseInAccountsPayableTrade	3807000	USD
CY2020	us-gaap	Increase Decrease In Accounts Payable Trade IncreaseDecreaseInAccountsPayableTrade	-10520000	USD
CY2019	us-gaap	Increase Decrease In Accounts Payable Trade IncreaseDecreaseInAccountsPayableTrade	-4438000	USD
CY2021	us-gaap	Increase Decrease In Accrued Liabilities IncreaseDecreaseInAccruedLiabilities	-688000	USD
CY2020	us-gaap	Increase Decrease In Accrued Liabilities IncreaseDecreaseInAccruedLiabilities	-17551000	USD
CY2019	us-gaap	Increase Decrease In Accrued Liabilities IncreaseDecreaseInAccruedLiabilities	8189000	USD
CY2021	us-gaap	Increase Decrease In Other Current Liabilities IncreaseDecreaseInOtherCurrentLiabilities	-8920000	USD
CY2020	us-gaap	Increase Decrease In Other Current Liabilities IncreaseDecreaseInOtherCurrentLiabilities	8685000	USD
CY2019	us-gaap	Increase Decrease In Other Current Liabilities IncreaseDecreaseInOtherCurrentLiabilities	3008000	USD
CY2021	tdw	Increase Decrease In Other Operating Liabilities And Deferred Credits IncreaseDecreaseInOtherOperatingLiabilitiesAndDeferredCredits	-6849000	USD
CY2020	tdw	Increase Decrease In Other Operating Liabilities And Deferred Credits IncreaseDecreaseInOtherOperatingLiabilitiesAndDeferredCredits	-20002000	USD
CY2019	tdw	Increase Decrease In Other Operating Liabilities And Deferred Credits IncreaseDecreaseInOtherOperatingLiabilitiesAndDeferredCredits	1270000	USD
CY2021	tdw	Increase Decrease In Cash Paid For Deferred Drydocking And Survey Costs IncreaseDecreaseInCashPaidForDeferredDrydockingAndSurveyCosts	27282000	USD
CY2020	tdw	Increase Decrease In Cash Paid For Deferred Drydocking And Survey Costs IncreaseDecreaseInCashPaidForDeferredDrydockingAndSurveyCosts	33271000	USD
CY2019	tdw	Increase Decrease In Cash Paid For Deferred Drydocking And Survey Costs IncreaseDecreaseInCashPaidForDeferredDrydockingAndSurveyCosts	70437000	USD
CY2021	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	-2165000	USD
CY2020	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	-8636000	USD
CY2019	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	3258000	USD
CY2021	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	15006000	USD
CY2020	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	3986000	USD
CY2019	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	-31423000	USD
CY2021	us-gaap	Proceeds From Sale Of Productive Assets ProceedsFromSaleOfProductiveAssets	34010000	USD
CY2020	us-gaap	Proceeds From Sale Of Productive Assets ProceedsFromSaleOfProductiveAssets	38296000	USD
CY2019	us-gaap	Proceeds From Sale Of Productive Assets ProceedsFromSaleOfProductiveAssets	28847000	USD
CY2021	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	8951000	USD
CY2020	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	14900000	USD
CY2019	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	17998000	USD
CY2021	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	25059000	USD
CY2020	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	23396000	USD
CY2019	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	10849000	USD
CY2021	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	172375000	USD
CY2020	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	0	USD
CY2019	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	0	USD
CY2021	us-gaap	Repayments Of Secured Debt RepaymentsOfSecuredDebt	198918000	USD
CY2020	us-gaap	Repayments Of Secured Debt RepaymentsOfSecuredDebt	98080000	USD
CY2019	us-gaap	Repayments Of Secured Debt RepaymentsOfSecuredDebt	133693000	USD
CY2021	us-gaap	Payments Of Debt Extinguishment Costs PaymentsOfDebtExtinguishmentCosts	7781000	USD
CY2020	us-gaap	Payments Of Debt Extinguishment Costs PaymentsOfDebtExtinguishmentCosts	-0	USD
CY2019	us-gaap	Payments Of Debt Extinguishment Costs PaymentsOfDebtExtinguishmentCosts	11402000	USD
CY2021	us-gaap	Payments Of Debt Restructuring Costs PaymentsOfDebtRestructuringCosts	5737000	USD
CY2020	us-gaap	Payments Of Debt Restructuring Costs PaymentsOfDebtRestructuringCosts	-0	USD
CY2019	us-gaap	Payments Of Debt Restructuring Costs PaymentsOfDebtRestructuringCosts	-0	USD
CY2021	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	953000	USD
CY2020	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	828000	USD
CY2019	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	4467000	USD
CY2021	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	0	USD
CY2020	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-857000	USD
CY2019	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	0	USD
CY2021	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-41014000	USD
CY2020	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-99765000	USD
CY2019	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-149562000	USD
CY2019Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	227608000	USD
CY2018Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	397744000	USD
CY2021Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	154276000	USD
CY2020Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	155225000	USD
CY2019Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	227608000	USD
CY2021	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	-949000	USD
CY2020	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	-72383000	USD
CY2019	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	-170136000	USD
CY2020Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	155225000	USD
CY2021	us-gaap	Interest Paid Net InterestPaidNet	13747000	USD
CY2020	us-gaap	Interest Paid Net InterestPaidNet	21235000	USD
CY2019	us-gaap	Interest Paid Net InterestPaidNet	32687000	USD
CY2021	us-gaap	Income Taxes Paid IncomeTaxesPaid	19013000	USD
CY2020	us-gaap	Income Taxes Paid IncomeTaxesPaid	13018000	USD
CY2019	us-gaap	Income Taxes Paid IncomeTaxesPaid	14378000	USD
CY2021	us-gaap	Use Of Estimates UseOfEstimates	<p style="font-family:'Times New Roman', Times, serif;font-size:10pt;margin:0pt;text-align:left;"><b>Use of Estimates in Preparation of Financial Statements </b></p> <p style="font-family:'Times New Roman', Times, serif;font-size:10pt;margin:0pt;text-align:left;"> </p> <p style="font-family:'Times New Roman', Times, serif;font-size:10pt;margin:0pt;text-align:justify;">The preparation of financial statements in conformity with accounting principles generally accepted in the United States of America requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the consolidated financial statements and the recorded amounts of revenues and expenses during the reporting period. The accompanying consolidated financial statements include estimates for allowance for credit losses, useful lives of property and equipment, estimated net realizable value of assets held for sale and marine operating supplies, income tax provisions, impairments, commitments and contingencies and certain accrued liabilities. We evaluate our estimates and assumptions on an ongoing basis based on a combination of historical information and various other assumptions that are considered reasonable under the circumstances, the results of which form the basis for making judgments about carrying values of assets and liabilities that are <em style="font: inherit;">not</em> readily apparent from other sources. These accounting policies involve judgment and uncertainties to such an extent that there is reasonable likelihood that materially different amounts could have been reported under different conditions or if different assumptions had been used and, as such, actual results <em style="font: inherit;"> may </em>differ from these estimates.</p> <p style="font-family:'Times New Roman', Times, serif;font-size:10pt;margin:0pt;text-align:justify;"> </p>
CY2021	tdw	Increase Of Amortization Period IncreaseOfAmortizationPeriod	P30M
CY2020	tdw	Due To Affiliate Commissions Paid DueToAffiliateCommissionsPaid	-0	USD
CY2021Q4	us-gaap	Machinery And Equipment Gross MachineryAndEquipmentGross	898649000	USD
CY2020Q4	us-gaap	Machinery And Equipment Gross MachineryAndEquipmentGross	940175000	USD
CY2021Q4	us-gaap	Property Plant And Equipment Other PropertyPlantAndEquipmentOther	19625000	USD
CY2020Q4	us-gaap	Property Plant And Equipment Other PropertyPlantAndEquipmentOther	16861000	USD
CY2021Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	918274000	USD
CY2020Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	957036000	USD
CY2021Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	230234000	USD
CY2020Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	176718000	USD
CY2021Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	688040000	USD
CY2020Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	780318000	USD
CY2021	tdw	Number Of Offshore Supply Vessels NumberOfOffshoreSupplyVessels	153	pure
CY2021	tdw	Number Of Vessels Disposed NumberOfVesselsDisposed	18	pure
CY2021	tdw	Number Of Vessels Disposed NumberOfVesselsDisposed	18	pure
CY2020	tdw	Number Of Offshore Supply Vessels NumberOfOffshoreSupplyVessels	172	pure
CY2020	tdw	Number Of Vessels Disposed NumberOfVesselsDisposed	23	pure
CY2021Q4	tdw	Number Of Ocean Going Tugs Contracted To Build NumberOfOceanGoingTugsContractedToBuild	2	pure
CY2021Q4	tdw	Ocean Going Tugs Expected Cost Each OceanGoingTugsExpectedCostEach	6300000	USD
CY2021Q4	tdw	Down Payments To Start Construction On Tugboats DownPaymentsToStartConstructionOnTugboats	2300000	USD
CY2019	tdw	Due To Affiliate Commissions Paid DueToAffiliateCommissionsPaid	5961000	USD
CY2021	tdw	Due To Related Party Amount Used To Offset Obligations DueToRelatedPartyAmountUsedToOffsetObligations	8530000	USD
CY2020	tdw	Due To Related Party Amount Used To Offset Obligations DueToRelatedPartyAmountUsedToOffsetObligations	11848000	USD
CY2019	tdw	Due To Related Party Amount Used To Offset Obligations DueToRelatedPartyAmountUsedToOffsetObligations	10551000	USD
CY2021	tdw	Due To Affiliate Other Increase Decrease DueToAffiliateOtherIncreaseDecrease	1449000	USD
CY2021	us-gaap	Net Income Loss NetIncomeLoss	-128969000	USD
CY2020	us-gaap	Net Income Loss NetIncomeLoss	-196242000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	-141743000	USD
CY2021	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	41008907
CY2020	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	40354638
CY2019	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	38204934
CY2021	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	0
CY2020	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	0
CY2019	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	0
CY2021	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	41008907
CY2020	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	40354638
CY2019	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	38204934
CY2021	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-3.14
CY2020	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-4.86
CY2019	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-3.71
CY2021	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-3.14
CY2020	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-4.86
CY2019	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-3.71
CY2021	us-gaap	Concentration Risk Credit Risk ConcentrationRiskCreditRisk	<p style="font-family:'Times New Roman', Times, serif;font-size:10pt;margin:0pt;text-align:left;"><b>Concentrations of Credit Risk </b></p> <p style="font-family: 'Times New Roman', Times, serif; font-size: 10pt; margin-top: 0pt; margin-bottom: 0pt;"> </p> <p style="font-family: "Times New Roman", Times, serif; font-size: 10pt; margin: 0pt; text-align: justify;">Our financial instruments that are exposed to concentrations of credit risk consist primarily of trade and other receivables from a variety of domestic, international and national energy companies. We manage our exposure to risk by performing ongoing credit evaluations of our customers’ financial condition and <em style="font: inherit;"> may </em>at times require prepayments or other forms of collateral. We also have net receivable balances related to joint ventures in which we own less than <em style="font: inherit;">50%.</em> We review and evaluate these receivables for collectability in a similar manner as we evaluate trade receivables. We maintain an allowance for credit loss based on expected collectability and do <em style="font: inherit;">not</em> believe we are generally exposed to concentrations of credit risk that are likely to have a material adverse impact on our financial position, results of operations, or cash flows.</p> <p style="font-family: 'Times New Roman', Times, serif; font-size: 10pt; margin-top: 0pt; margin-bottom: 0pt;"> </p>
CY2020Q4	us-gaap	Long Term Debt Current LongTermDebtCurrent	27797000	USD
CY2021Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	167885000	USD
CY2020Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	164934000	USD
CY2020Q4	us-gaap	Restricted Cash Current RestrictedCashCurrent	2100000	USD
CY2019Q4	us-gaap	Allowance For Doubtful Accounts Receivable AllowanceForDoubtfulAccountsReceivable	2700000	USD
CY2019	us-gaap	Allowance For Doubtful Accounts Receivable Write Offs AllowanceForDoubtfulAccountsReceivableWriteOffs	2600000	USD
CY2021Q4	us-gaap	Debt Instrument Carrying Amount DebtInstrumentCarryingAmount	175000000	USD
CY2020Q4	us-gaap	Debt Instrument Carrying Amount DebtInstrumentCarryingAmount	197975000	USD
CY2021Q4	us-gaap	Debt Instrument Unamortized Discount Premium Net DebtInstrumentUnamortizedDiscountPremiumNet	7115000	USD
CY2020Q4	us-gaap	Debt Instrument Unamortized Discount Premium Net DebtInstrumentUnamortizedDiscountPremiumNet	5244000	USD
CY2021Q4	us-gaap	Long Term Debt Current LongTermDebtCurrent	-0	USD
CY2021	us-gaap	Interest And Debt Expense InterestAndDebtExpense	15607000	USD
CY2020	us-gaap	Interest And Debt Expense InterestAndDebtExpense	24156000	USD
CY2019	us-gaap	Interest And Debt Expense InterestAndDebtExpense	29068000	USD
CY2021	us-gaap	Interest Costs Capitalized InterestCostsCapitalized	24000	USD
CY2020	us-gaap	Interest Costs Capitalized InterestCostsCapitalized	-0	USD
CY2019	us-gaap	Interest Costs Capitalized InterestCostsCapitalized	-0	USD
CY2021	us-gaap	Interest Costs Incurred InterestCostsIncurred	15583000	USD
CY2020	us-gaap	Interest Costs Incurred InterestCostsIncurred	24156000	USD
CY2019	us-gaap	Interest Costs Incurred InterestCostsIncurred	29068000	USD
CY2021Q4	us-gaap	Due From Related Parties Current DueFromRelatedPartiesCurrent	70134000	USD
CY2020Q4	us-gaap	Due From Related Parties Current DueFromRelatedPartiesCurrent	62050000	USD
CY2021Q4	us-gaap	Due To Related Parties Current DueToRelatedPartiesCurrent	61555000	USD
CY2020Q4	us-gaap	Due To Related Parties Current DueToRelatedPartiesCurrent	53194000	USD
CY2021Q4	us-gaap	Related Party Transaction Due From To Related Party Current RelatedPartyTransactionDueFromToRelatedPartyCurrent	8579000	USD
CY2020Q4	us-gaap	Related Party Transaction Due From To Related Party Current RelatedPartyTransactionDueFromToRelatedPartyCurrent	8856000	USD
CY2020Q4	us-gaap	Due To Affiliate Current And Noncurrent DueToAffiliateCurrentAndNoncurrent	32767000	USD
CY2019Q4	us-gaap	Due To Affiliate Current And Noncurrent DueToAffiliateCurrentAndNoncurrent	31475000	USD
CY2018Q4	us-gaap	Due To Affiliate Current And Noncurrent DueToAffiliateCurrentAndNoncurrent	29347000	USD
CY2021	tdw	Due To Affiliate Commisions To Be Paid DueToAffiliateCommisionsToBePaid	3832000	USD
CY2020	tdw	Due To Affiliate Commisions To Be Paid DueToAffiliateCommisionsToBePaid	4152000	USD
CY2019	tdw	Due To Affiliate Commisions To Be Paid DueToAffiliateCommisionsToBePaid	4937000	USD
CY2021	tdw	Due To Affiliate Amounts Paid By Affiliate DueToAffiliateAmountsPaidByAffiliate	10914000	USD
CY2020	tdw	Due To Affiliate Amounts Paid By Affiliate DueToAffiliateAmountsPaidByAffiliate	9037000	USD
CY2019	tdw	Due To Affiliate Amounts Paid By Affiliate DueToAffiliateAmountsPaidByAffiliate	9654000	USD
CY2021	tdw	Due To Affiliate Commissions Paid DueToAffiliateCommissionsPaid	-0	USD
CY2020	tdw	Due To Affiliate Other Increase Decrease DueToAffiliateOtherIncreaseDecrease	-49000	USD
CY2019	tdw	Due To Affiliate Other Increase Decrease DueToAffiliateOtherIncreaseDecrease	4049000	USD
CY2021Q4	us-gaap	Due To Affiliate Current And Noncurrent DueToAffiliateCurrentAndNoncurrent	40432000	USD
CY2020Q4	us-gaap	Due To Affiliate Current And Noncurrent DueToAffiliateCurrentAndNoncurrent	32767000	USD
CY2019Q4	us-gaap	Due To Affiliate Current And Noncurrent DueToAffiliateCurrentAndNoncurrent	31475000	USD
CY2021	us-gaap	Income Loss From Continuing Operations Before Income Taxes Foreign IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign	-58476000	USD
CY2020	us-gaap	Income Loss From Continuing Operations Before Income Taxes Foreign IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign	-137225000	USD
CY2019	us-gaap	Income Loss From Continuing Operations Before Income Taxes Foreign IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign	-44205000	USD
CY2021	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	-65309000	USD
CY2020	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	-60436000	USD
CY2019	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	-69290000	USD
CY2021	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	-123785000	USD
CY2020	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	-197661000	USD
CY2019	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	-113495000	USD
CY2019	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	649000	USD
CY2019	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	0	USD
CY2019	us-gaap	Current Foreign Tax Expense Benefit CurrentForeignTaxExpenseBenefit	26403000	USD
CY2019	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	27052000	USD
CY2019	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	672000	USD
CY2019	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	0	USD
CY2019	us-gaap	Deferred Foreign Income Tax Expense Benefit DeferredForeignIncomeTaxExpenseBenefit	0	USD
CY2019	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	672000	USD
CY2019	us-gaap	Federal Income Tax Expense Benefit Continuing Operations FederalIncomeTaxExpenseBenefitContinuingOperations	1321000	USD
CY2019	us-gaap	State And Local Income Tax Expense Benefit Continuing Operations StateAndLocalIncomeTaxExpenseBenefitContinuingOperations	0	USD
CY2019	us-gaap	Foreign Income Tax Expense Benefit Continuing Operations ForeignIncomeTaxExpenseBenefitContinuingOperations	26403000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	27724000	USD
CY2020	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	-21005000	USD
CY2020	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	0	USD
CY2020	us-gaap	Current Foreign Tax Expense Benefit CurrentForeignTaxExpenseBenefit	18816000	USD
CY2020	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	-2189000	USD
CY2020	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	-30000	USD
CY2020	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	0	USD
CY2020	us-gaap	Deferred Foreign Income Tax Expense Benefit DeferredForeignIncomeTaxExpenseBenefit	1254000	USD
CY2020	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	1224000	USD
CY2020	us-gaap	Federal Income Tax Expense Benefit Continuing Operations FederalIncomeTaxExpenseBenefitContinuingOperations	-21035000	USD
CY2020	us-gaap	State And Local Income Tax Expense Benefit Continuing Operations StateAndLocalIncomeTaxExpenseBenefitContinuingOperations	0	USD
CY2020	us-gaap	Foreign Income Tax Expense Benefit Continuing Operations ForeignIncomeTaxExpenseBenefitContinuingOperations	20070000	USD
CY2020	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-965000	USD
CY2021	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	682000	USD
CY2021	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	0	USD
CY2021	us-gaap	Current Foreign Tax Expense Benefit CurrentForeignTaxExpenseBenefit	6480000	USD
CY2021	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	7162000	USD
CY2021	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	-1418000	USD
CY2021	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	0	USD
CY2021	us-gaap	Deferred Foreign Income Tax Expense Benefit DeferredForeignIncomeTaxExpenseBenefit	131000	USD
CY2021	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-1287000	USD
CY2021	us-gaap	Federal Income Tax Expense Benefit Continuing Operations FederalIncomeTaxExpenseBenefitContinuingOperations	-736000	USD
CY2021	us-gaap	State And Local Income Tax Expense Benefit Continuing Operations StateAndLocalIncomeTaxExpenseBenefitContinuingOperations	0	USD
CY2021	us-gaap	Foreign Income Tax Expense Benefit Continuing Operations ForeignIncomeTaxExpenseBenefitContinuingOperations	6611000	USD
CY2021	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	5875000	USD
CY2021	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.21	pure
CY2021	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	-25995000	USD
CY2020	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	-41509000	USD
CY2019	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	-23834000	USD
CY2021	us-gaap	Income Tax Reconciliation Foreign Income Tax Rate Differential IncomeTaxReconciliationForeignIncomeTaxRateDifferential	10984000	USD
CY2020	us-gaap	Income Tax Reconciliation Foreign Income Tax Rate Differential IncomeTaxReconciliationForeignIncomeTaxRateDifferential	27639000	USD
CY2019	us-gaap	Income Tax Reconciliation Foreign Income Tax Rate Differential IncomeTaxReconciliationForeignIncomeTaxRateDifferential	9283000	USD
CY2021	tdw	Income Tax Reconciliation Uncertain Tax Position IncomeTaxReconciliationUncertainTaxPosition	-25417000	USD
CY2020	tdw	Income Tax Reconciliation Uncertain Tax Position IncomeTaxReconciliationUncertainTaxPosition	-62833000	USD
CY2019	tdw	Income Tax Reconciliation Uncertain Tax Position IncomeTaxReconciliationUncertainTaxPosition	5145000	USD
CY2021	us-gaap	Income Tax Reconciliation Change In Deferred Tax Assets Valuation Allowance IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	34566000	USD
CY2020	us-gaap	Income Tax Reconciliation Change In Deferred Tax Assets Valuation Allowance IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	43455000	USD
CY2019	us-gaap	Income Tax Reconciliation Change In Deferred Tax Assets Valuation Allowance IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	15707000	USD
CY2021	tdw	Effective Income Tax Rate Reconciliation Deferred Tax True Up Valuation Allowance Amount EffectiveIncomeTaxRateReconciliationDeferredTaxTrueUpValuationAllowanceAmount	29711000	USD
CY2020	tdw	Effective Income Tax Rate Reconciliation Deferred Tax True Up Valuation Allowance Amount EffectiveIncomeTaxRateReconciliationDeferredTaxTrueUpValuationAllowanceAmount	-6523000	USD
CY2019	tdw	Effective Income Tax Rate Reconciliation Deferred Tax True Up Valuation Allowance Amount EffectiveIncomeTaxRateReconciliationDeferredTaxTrueUpValuationAllowanceAmount	0	USD
CY2021	tdw	Effective Income Tax Rate Reconciliation Deferred Tax True Up Amount EffectiveIncomeTaxRateReconciliationDeferredTaxTrueUpAmount	-29789000	USD
CY2020	tdw	Effective Income Tax Rate Reconciliation Deferred Tax True Up Amount EffectiveIncomeTaxRateReconciliationDeferredTaxTrueUpAmount	6523000	USD
CY2019	tdw	Effective Income Tax Rate Reconciliation Deferred Tax True Up Amount EffectiveIncomeTaxRateReconciliationDeferredTaxTrueUpAmount	0	USD
CY2021	tdw	Income Tax Reconciliation Increase Decrease In Foreign Taxes IncomeTaxReconciliationIncreaseDecreaseInForeignTaxes	-15220000	USD
CY2020	tdw	Income Tax Reconciliation Increase Decrease In Foreign Taxes IncomeTaxReconciliationIncreaseDecreaseInForeignTaxes	-12520000	USD
CY2019	tdw	Income Tax Reconciliation Increase Decrease In Foreign Taxes IncomeTaxReconciliationIncreaseDecreaseInForeignTaxes	-20778000	USD
CY2021	tdw	Income Tax Reconciliation Return To Accrual IncomeTaxReconciliationReturnToAccrual	-7691000	USD
CY2020	tdw	Income Tax Reconciliation Return To Accrual IncomeTaxReconciliationReturnToAccrual	11401000	USD
CY2019	tdw	Income Tax Reconciliation Return To Accrual IncomeTaxReconciliationReturnToAccrual	-2247000	USD
CY2021	tdw	Income Tax Reconciliation Executive Compensation IncomeTaxReconciliationExecutiveCompensation	125000	USD
CY2020	tdw	Income Tax Reconciliation Executive Compensation IncomeTaxReconciliationExecutiveCompensation	286000	USD
CY2019	tdw	Income Tax Reconciliation Executive Compensation IncomeTaxReconciliationExecutiveCompensation	28000	USD
CY2021	us-gaap	Income Tax Reconciliation Tax Exempt Income IncomeTaxReconciliationTaxExemptIncome	-484000	USD
CY2020	us-gaap	Income Tax Reconciliation Tax Exempt Income IncomeTaxReconciliationTaxExemptIncome	-5631000	USD
CY2019	us-gaap	Income Tax Reconciliation Tax Exempt Income IncomeTaxReconciliationTaxExemptIncome	-1227000	USD
CY2021	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	3677000	USD
CY2020	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	2445000	USD
CY2019	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	1637000	USD
CY2021	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	5875000	USD
CY2020	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-965000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	27724000	USD
CY2021Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Pensions DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPensions	7275000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Pensions DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPensions	8815000	USD
CY2021Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Share Based Compensation Cost DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost	649000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Share Based Compensation Cost DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost	407000	USD
CY2021Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	215797000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	148699000	USD
CY2021Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Restructuring Charges DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsRestructuringCharges	566000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Restructuring Charges DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsRestructuringCharges	1415000	USD
CY2021Q4	us-gaap	Deferred Tax Asset Interest Carryforward DeferredTaxAssetInterestCarryforward	10386000	USD
CY2020Q4	us-gaap	Deferred Tax Asset Interest Carryforward DeferredTaxAssetInterestCarryforward	5546000	USD
CY2021Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	3152000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	2518000	USD
CY2021Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	237825000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	167400000	USD
CY2021Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	204899000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	140428000	USD
CY2021Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	32926000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	26972000	USD
CY2021Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	31745000	USD
CY2020Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	25883000	USD
CY2021Q4	tdw	Deferred Tax Liability Outside Basis Difference DeferredTaxLiabilityOutsideBasisDifference	2891000	USD
CY2020Q4	tdw	Deferred Tax Liability Outside Basis Difference DeferredTaxLiabilityOutsideBasisDifference	2891000	USD
CY2021Q4	tdw	Deferred Tax Liabilities Foreign Interest Withholding Tax DeferredTaxLiabilitiesForeignInterestWithholdingTax	990000	USD
CY2020Q4	tdw	Deferred Tax Liabilities Foreign Interest Withholding Tax DeferredTaxLiabilitiesForeignInterestWithholdingTax	859000	USD
CY2021Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	-572000	USD
CY2020Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	754000	USD
CY2021Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	35054000	USD
CY2020Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	30387000	USD
CY2021Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	2128000	USD
CY2020Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	3415000	USD
CY2020	tdw	Income Tax Benefit Cares Act IncomeTaxBenefitCaresAct	6900000	USD
CY2021	tdw	Annual Limitation Of Companys Ownership Change AnnualLimitationOfCompanysOwnershipChange	15000000.0	USD
CY2021Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	204900000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	140400000	USD
CY2021Q4	us-gaap	Undistributed Earnings Of Foreign Subsidiaries UndistributedEarningsOfForeignSubsidiaries	36400000	USD
CY2021Q4	us-gaap	Liability For Uncertain Tax Positions Noncurrent LiabilityForUncertainTaxPositionsNoncurrent	29283000	USD
CY2020Q4	us-gaap	Liability For Uncertain Tax Positions Noncurrent LiabilityForUncertainTaxPositionsNoncurrent	35304000	USD
CY2021Q4	us-gaap	Taxes Payable Current TaxesPayableCurrent	11480000	USD
CY2020Q4	us-gaap	Taxes Payable Current TaxesPayableCurrent	15928000	USD
CY2021Q4	us-gaap	Income Taxes Receivable IncomeTaxesReceivable	1322000	USD
CY2020Q4	us-gaap	Income Taxes Receivable IncomeTaxesReceivable	8280000	USD
CY2021Q4	us-gaap	Unrecognized Tax Benefits Income Tax Penalties Accrued UnrecognizedTaxBenefitsIncomeTaxPenaltiesAccrued	17800000	USD
CY2020Q4	us-gaap	Unrecognized Tax Benefits Income Tax Penalties Accrued UnrecognizedTaxBenefitsIncomeTaxPenaltiesAccrued	22100000	USD
CY2018Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	399292000	USD
CY2019	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	14741000	USD
CY2019	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	1964000	USD
CY2019	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	1897000	USD
CY2019	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	58000	USD
CY2019Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	414042000	USD
CY2020	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	2223000	USD
CY2020	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	64458000	USD
CY2020	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	760000	USD
CY2020Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	351047000	USD
CY2021	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	53000	USD
CY2021	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	18515000	USD
CY2021	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	35962000	USD
CY2021Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	333653000	USD
CY2021Q4	tdw	Foreign Tax Credits And Other Tax Attributes ForeignTaxCreditsAndOtherTaxAttributes	322100000	USD
CY2021	us-gaap	Unrecognized Tax Benefits Period Increase Decrease UnrecognizedTaxBenefitsPeriodIncreaseDecrease	6400000	USD
CY2021Q4	us-gaap	Unrecognized Tax Benefits That Would Impact Effective Tax Rate UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	29300000	USD
CY2020Q4	us-gaap	Unrecognized Tax Benefits That Would Impact Effective Tax Rate UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	35300000	USD
CY2019	us-gaap	Operating Lease Payments OperatingLeasePayments	1400000	USD
CY2021	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	300000	USD
CY2021Q4	us-gaap	Lessee Operating Lease Liability Payments Due Next Twelve Months LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths	2205000	USD
CY2021Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Two LesseeOperatingLeaseLiabilityPaymentsDueYearTwo	1183000	USD
CY2021Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Three LesseeOperatingLeaseLiabilityPaymentsDueYearThree	741000	USD
CY2021Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Four LesseeOperatingLeaseLiabilityPaymentsDueYearFour	748000	USD
CY2021Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Five LesseeOperatingLeaseLiabilityPaymentsDueYearFive	680000	USD
CY2021Q4	us-gaap	Lessee Operating Lease Liability Payments Due After Year Five LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive	316000	USD
CY2021Q4	us-gaap	Lessee Operating Lease Liability Payments Due LesseeOperatingLeaseLiabilityPaymentsDue	5873000	USD
CY2021Q4	us-gaap	Lessee Operating Lease Liability Undiscounted Excess Amount LesseeOperatingLeaseLiabilityUndiscountedExcessAmount	1167000	USD
CY2021	us-gaap	Operating Lease Cost OperatingLeaseCost	1369000	USD
CY2020	us-gaap	Operating Lease Cost OperatingLeaseCost	1270000	USD
CY2019	us-gaap	Operating Lease Cost OperatingLeaseCost	1336000	USD
CY2021	us-gaap	Short Term Lease Cost ShortTermLeaseCost	2529000	USD
CY2020	us-gaap	Short Term Lease Cost ShortTermLeaseCost	3483000	USD
CY2019	us-gaap	Short Term Lease Cost ShortTermLeaseCost	4840000	USD
CY2021	us-gaap	Variable Lease Cost VariableLeaseCost	412000	USD
CY2020	us-gaap	Variable Lease Cost VariableLeaseCost	392000	USD
CY2019	us-gaap	Variable Lease Cost VariableLeaseCost	313000	USD
CY2021	us-gaap	Sublease Income SubleaseIncome	-0	USD
CY2020	us-gaap	Sublease Income SubleaseIncome	-0	USD
CY2019	us-gaap	Sublease Income SubleaseIncome	3000	USD
CY2021	us-gaap	Lease Cost LeaseCost	4310000	USD
CY2020	us-gaap	Lease Cost LeaseCost	5145000	USD
CY2019	us-gaap	Lease Cost LeaseCost	6486000	USD
CY2021Q4	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P3Y3M18D
CY2021Q4	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.074	pure
CY2021	us-gaap	Operating Lease Payments OperatingLeasePayments	1800000	USD
CY2020	us-gaap	Operating Lease Payments OperatingLeasePayments	1000000.0	USD
CY2020	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	300000	USD
CY2019	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	800000	USD
CY2019	tdw	Number Of Vessels Held For Sale Addition NumberOfVesselsHeldForSaleAddition	46	pure
CY2019	tdw	Number Of Vessels Held For Sale Addition Percentage NumberOfVesselsHeldForSaleAdditionPercentage	0.20	pure
CY2020	tdw	Number Of Vessels Held For Sale Addition NumberOfVesselsHeldForSaleAddition	32	pure
CY2021	tdw	Number Of Vessels Transfer From Held For Sale To Active Fleet NumberOfVesselsTransferFromHeldForSaleToActiveFleet	3	pure
CY2021Q4	tdw	Number Of Vessels Held For Sale NumberOfVesselsHeldForSale	18	pure
CY2021	tdw	Number Of Active Vessels Sold NumberOfActiveVesselsSold	10	pure
CY2021	tdw	Proceeds From Sale Of Vessels And Other Assets ProceedsFromSaleOfVesselsAndOtherAssets	34000000.0	USD
CY2020	tdw	Proceeds From Sale Of Vessels And Other Assets ProceedsFromSaleOfVesselsAndOtherAssets	38300000	USD
CY2019	us-gaap	Defined Benefit Plan Interest Cost DefinedBenefitPlanInterestCost	3751000	USD
CY2021	us-gaap	Defined Benefit Plan Benefit Obligation Benefits Paid DefinedBenefitPlanBenefitObligationBenefitsPaid	5693000	USD
CY2021Q4	tdw	Defined Benefit Plan Concentration Risk Assets Equity Securities Difference Plan Assets And Liabilities DefinedBenefitPlanConcentrationRiskAssetsEquitySecuritiesDifferencePlanAssetsAndLiabilities	0.25	pure
CY2020	tdw	Number Of Vessels Held For Sale Sold NumberOfVesselsHeldForSaleSold	53	pure
CY2020Q4	tdw	Number Of Vessels Held For Sale NumberOfVesselsHeldForSale	23	pure
CY2020	tdw	Number Of Active Vessels Sold NumberOfActiveVesselsSold	3	pure
CY2021	tdw	Number Of Vessels Sold NumberOfVesselsSold	9	pure
CY2021	tdw	Number Of Vessels Held For Sale Addition NumberOfVesselsHeldForSaleAddition	7	pure
CY2020	us-gaap	Defined Benefit Plan Benefit Obligation Benefits Paid DefinedBenefitPlanBenefitObligationBenefitsPaid	5990000	USD
CY2019	us-gaap	Defined Benefit Plan Benefit Obligation Benefits Paid DefinedBenefitPlanBenefitObligationBenefitsPaid	5967000	USD
CY2021	us-gaap	Defined Benefit Plan Actuarial Gain Loss DefinedBenefitPlanActuarialGainLoss	1127000	USD
CY2020	us-gaap	Defined Benefit Plan Actuarial Gain Loss DefinedBenefitPlanActuarialGainLoss	-5277000	USD
CY2021	us-gaap	Impairment Of Long Lived Assets To Be Disposed Of ImpairmentOfLongLivedAssetsToBeDisposedOf	13700000	USD
CY2020	us-gaap	Impairment Of Long Lived Assets To Be Disposed Of ImpairmentOfLongLivedAssetsToBeDisposedOf	75200000	USD
CY2019	us-gaap	Impairment Of Long Lived Assets To Be Disposed Of ImpairmentOfLongLivedAssetsToBeDisposedOf	26700000	USD
CY2021	tdw	Impairment Charge Recaptured ImpairmentChargeRecaptured	1700000	USD
CY2020	tdw	Impairment Charge Recaptured ImpairmentChargeRecaptured	1000000.0	USD
CY2011Q4	us-gaap	Other Assets OtherAssets	1800000	USD
CY2019	tdw	Unpaid Milestone Payments UnpaidMilestonePayments	4000000.0	USD
CY2019Q4	tdw	Impairment Charge On Under Construction Asset ImpairmentChargeOnUnderConstructionAsset	5800000	USD
CY2020Q4	tdw	Expense Recovered On Contract To Shipyard ExpenseRecoveredOnContractToShipyard	4000000.0	USD
CY2021	tdw	Number Of Vessels Held For Sale Reactivation NumberOfVesselsHeldForSaleReactivation	1	pure
CY2020	tdw	Number Of Vessels Held For Sale Reactivation NumberOfVesselsHeldForSaleReactivation	0	pure
CY2019	tdw	Number Of Vessels Held For Sale Reactivation NumberOfVesselsHeldForSaleReactivation	0	pure
CY2021	us-gaap	Asset Impairment Charges AssetImpairmentCharges	15643000	USD
CY2020	us-gaap	Asset Impairment Charges AssetImpairmentCharges	74109000	USD
CY2019	us-gaap	Asset Impairment Charges AssetImpairmentCharges	37773000	USD
CY2019	us-gaap	Defined Benefit Plan Settlements Plan Assets DefinedBenefitPlanSettlementsPlanAssets	4638000	USD
CY2019	us-gaap	Defined Benefit Plan Actuarial Gain Loss DefinedBenefitPlanActuarialGainLoss	-8198000	USD
CY2021	us-gaap	Defined Benefit Plan Settlements Benefit Obligation DefinedBenefitPlanSettlementsBenefitObligation	-0	USD
CY2020Q4	us-gaap	Defined Benefit Plan Benefit Obligation DefinedBenefitPlanBenefitObligation	88960000	USD
CY2019Q4	us-gaap	Defined Benefit Plan Benefit Obligation DefinedBenefitPlanBenefitObligation	91654000	USD
CY2018Q4	us-gaap	Defined Benefit Plan Benefit Obligation DefinedBenefitPlanBenefitObligation	90247000	USD
CY2021	us-gaap	Defined Benefit Plan Service Cost DefinedBenefitPlanServiceCost	0	USD
CY2020	us-gaap	Defined Benefit Plan Service Cost DefinedBenefitPlanServiceCost	112000	USD
CY2019	us-gaap	Defined Benefit Plan Service Cost DefinedBenefitPlanServiceCost	427000	USD
CY2021	us-gaap	Defined Benefit Plan Interest Cost DefinedBenefitPlanInterestCost	2168000	USD
CY2020	us-gaap	Defined Benefit Plan Interest Cost DefinedBenefitPlanInterestCost	2907000	USD
CY2020	us-gaap	Defined Benefit Plan Settlements Benefit Obligation DefinedBenefitPlanSettlementsBenefitObligation	4407000	USD
CY2019	us-gaap	Defined Benefit Plan Settlements Benefit Obligation DefinedBenefitPlanSettlementsBenefitObligation	4978000	USD
CY2021	us-gaap	Defined Benefit Plan Foreign Currency Exchange Rate Changes Benefit Obligation DefinedBenefitPlanForeignCurrencyExchangeRateChangesBenefitObligation	-0	USD
CY2020	us-gaap	Defined Benefit Plan Foreign Currency Exchange Rate Changes Benefit Obligation DefinedBenefitPlanForeignCurrencyExchangeRateChangesBenefitObligation	593000	USD
CY2019	us-gaap	Defined Benefit Plan Foreign Currency Exchange Rate Changes Benefit Obligation DefinedBenefitPlanForeignCurrencyExchangeRateChangesBenefitObligation	24000	USD
CY2021Q4	us-gaap	Defined Benefit Plan Benefit Obligation DefinedBenefitPlanBenefitObligation	84308000	USD
CY2020Q4	us-gaap	Defined Benefit Plan Benefit Obligation DefinedBenefitPlanBenefitObligation	88960000	USD
CY2019Q4	us-gaap	Defined Benefit Plan Benefit Obligation DefinedBenefitPlanBenefitObligation	91654000	USD
CY2020Q4	us-gaap	Defined Benefit Plan Fair Value Of Plan Assets DefinedBenefitPlanFairValueOfPlanAssets	56495000	USD
CY2019Q4	us-gaap	Defined Benefit Plan Fair Value Of Plan Assets DefinedBenefitPlanFairValueOfPlanAssets	59625000	USD
CY2018Q4	us-gaap	Defined Benefit Plan Fair Value Of Plan Assets DefinedBenefitPlanFairValueOfPlanAssets	56790000	USD
CY2021	us-gaap	Defined Benefit Plan Actual Return On Plan Assets DefinedBenefitPlanActualReturnOnPlanAssets	4374000	USD
CY2020	us-gaap	Defined Benefit Plan Actual Return On Plan Assets DefinedBenefitPlanActualReturnOnPlanAssets	6890000	USD
CY2019	us-gaap	Defined Benefit Plan Actual Return On Plan Assets DefinedBenefitPlanActualReturnOnPlanAssets	7498000	USD
CY2021	tdw	Defined Benefit Plan Plan Assets Actuarial Gain Loss DefinedBenefitPlanPlanAssetsActuarialGainLoss	0	USD
CY2020	tdw	Defined Benefit Plan Plan Assets Actuarial Gain Loss DefinedBenefitPlanPlanAssetsActuarialGainLoss	18000	USD
CY2019	tdw	Defined Benefit Plan Plan Assets Actuarial Gain Loss DefinedBenefitPlanPlanAssetsActuarialGainLoss	983000	USD
CY2021	tdw	Defined Benefit Plan Administrative Expenses DefinedBenefitPlanAdministrativeExpenses	-0	USD
CY2020	tdw	Defined Benefit Plan Administrative Expenses DefinedBenefitPlanAdministrativeExpenses	49000	USD
CY2019	tdw	Defined Benefit Plan Administrative Expenses DefinedBenefitPlanAdministrativeExpenses	68000	USD
CY2021	us-gaap	Defined Benefit Plan Contributions By Employer DefinedBenefitPlanContributionsByEmployer	1603000	USD
CY2020	us-gaap	Defined Benefit Plan Contributions By Employer DefinedBenefitPlanContributionsByEmployer	1615000	USD
CY2019	us-gaap	Defined Benefit Plan Contributions By Employer DefinedBenefitPlanContributionsByEmployer	5027000	USD
CY2021	us-gaap	Defined Benefit Plan Plan Assets Benefits Paid DefinedBenefitPlanPlanAssetsBenefitsPaid	5693000	USD
CY2020	us-gaap	Defined Benefit Plan Plan Assets Benefits Paid DefinedBenefitPlanPlanAssetsBenefitsPaid	5990000	USD
CY2019	us-gaap	Defined Benefit Plan Plan Assets Benefits Paid DefinedBenefitPlanPlanAssetsBenefitsPaid	5967000	USD
CY2021	us-gaap	Defined Benefit Plan Settlements Plan Assets DefinedBenefitPlanSettlementsPlanAssets	-0	USD
CY2020	us-gaap	Defined Benefit Plan Settlements Plan Assets DefinedBenefitPlanSettlementsPlanAssets	5000000	USD
CY2021	us-gaap	Defined Benefit Plan Plan Assets Foreign Currency Translation Gain Loss DefinedBenefitPlanPlanAssetsForeignCurrencyTranslationGainLoss	0	USD
CY2020	us-gaap	Defined Benefit Plan Plan Assets Foreign Currency Translation Gain Loss DefinedBenefitPlanPlanAssetsForeignCurrencyTranslationGainLoss	-614000	USD
CY2019	us-gaap	Defined Benefit Plan Plan Assets Foreign Currency Translation Gain Loss DefinedBenefitPlanPlanAssetsForeignCurrencyTranslationGainLoss	0	USD
CY2021Q4	us-gaap	Defined Benefit Plan Fair Value Of Plan Assets DefinedBenefitPlanFairValueOfPlanAssets	56779000	USD
CY2020Q4	us-gaap	Defined Benefit Plan Fair Value Of Plan Assets DefinedBenefitPlanFairValueOfPlanAssets	56495000	USD
CY2019Q4	us-gaap	Defined Benefit Plan Fair Value Of Plan Assets DefinedBenefitPlanFairValueOfPlanAssets	59625000	USD
CY2021	tdw	Defined Benefit Plan Unfunded Status Of Plan DefinedBenefitPlanUnfundedStatusOfPlan	27529000	USD
CY2020	tdw	Defined Benefit Plan Unfunded Status Of Plan DefinedBenefitPlanUnfundedStatusOfPlan	32465000	USD
CY2019	tdw	Defined Benefit Plan Unfunded Status Of Plan DefinedBenefitPlanUnfundedStatusOfPlan	32029000	USD
CY2021Q4	us-gaap	Pension And Other Postretirement Defined Benefit Plans Current Liabilities PensionAndOtherPostretirementDefinedBenefitPlansCurrentLiabilities	1578000	USD
CY2020Q4	us-gaap	Pension And Other Postretirement Defined Benefit Plans Current Liabilities PensionAndOtherPostretirementDefinedBenefitPlansCurrentLiabilities	1524000	USD
CY2019Q4	us-gaap	Pension And Other Postretirement Defined Benefit Plans Current Liabilities PensionAndOtherPostretirementDefinedBenefitPlansCurrentLiabilities	1422000	USD
CY2021Q4	us-gaap	Pension And Other Postretirement Defined Benefit Plans Liabilities Noncurrent PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent	25951000	USD
CY2020Q4	us-gaap	Pension And Other Postretirement Defined Benefit Plans Liabilities Noncurrent PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent	30941000	USD
CY2019Q4	us-gaap	Pension And Other Postretirement Defined Benefit Plans Liabilities Noncurrent PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent	30607000	USD
CY2021Q4	us-gaap	Pension And Other Postretirement Defined Benefit Plans Liabilities Current And Noncurrent PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesCurrentAndNoncurrent	27529000	USD
CY2020Q4	us-gaap	Pension And Other Postretirement Defined Benefit Plans Liabilities Current And Noncurrent PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesCurrentAndNoncurrent	32465000	USD
CY2019Q4	us-gaap	Pension And Other Postretirement Defined Benefit Plans Liabilities Current And Noncurrent PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesCurrentAndNoncurrent	32029000	USD
CY2021Q4	us-gaap	Defined Benefit Plan Expected Future Benefit Payments Five Fiscal Years Thereafter DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter	26188000	USD
CY2021Q4	tdw	Defined Benefit Plan Expected Future Benefit Payments DefinedBenefitPlanExpectedFutureBenefitPayments	55172000	USD
CY2021	tdw	Defined Contribution Plan Company Contribution Percentage DefinedContributionPlanCompanyContributionPercentage	0.03	pure
CY2021Q4	us-gaap	Defined Benefit Plan Benefit Obligation DefinedBenefitPlanBenefitObligation	84308000	USD
CY2020Q4	us-gaap	Defined Benefit Plan Benefit Obligation DefinedBenefitPlanBenefitObligation	88960000	USD
CY2021Q4	us-gaap	Defined Benefit Plan Fair Value Of Plan Assets DefinedBenefitPlanFairValueOfPlanAssets	56779000	USD
CY2020Q4	us-gaap	Defined Benefit Plan Fair Value Of Plan Assets DefinedBenefitPlanFairValueOfPlanAssets	56495000	USD
CY2021Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Available For Grant ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant	3037187
CY2020Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Available For Grant ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant	1591577
CY2019Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Available For Grant ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant	2187101
CY2021Q4	us-gaap	Defined Benefit Plan Assumptions Used Calculating Benefit Obligation Discount Rate DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate	0.0285	pure
CY2020Q4	us-gaap	Defined Benefit Plan Assumptions Used Calculating Benefit Obligation Discount Rate DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate	0.025	pure
CY2021Q4	us-gaap	Other Accrued Liabilities Current OtherAccruedLiabilitiesCurrent	11586000	USD
CY2020Q4	us-gaap	Other Accrued Liabilities Current OtherAccruedLiabilitiesCurrent	14852000	USD
CY2021Q4	us-gaap	Accrued Liabilities Current AccruedLiabilitiesCurrent	51734000	USD
CY2021Q4	us-gaap	Defined Benefit Plan Expected Future Benefit Payments Next Twelve Months DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths	5911000	USD
CY2021Q4	us-gaap	Defined Benefit Plan Expected Future Benefit Payments Year Two DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo	5863000	USD
CY2021Q4	us-gaap	Defined Benefit Plan Expected Future Benefit Payments Year Three DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree	5816000	USD
CY2021Q4	us-gaap	Defined Benefit Plan Expected Future Benefit Payments Year Four DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour	5746000	USD
CY2021Q4	us-gaap	Defined Benefit Plan Expected Future Benefit Payments Year Five DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive	5648000	USD
CY2021Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Authorized ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized	6473228
CY2020Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Authorized ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized	3973228
CY2019Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Authorized ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized	3973228
CY2021	tdw	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodGrantDateFairValue	4460000	USD
CY2020	tdw	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodGrantDateFairValue	6395000	USD
CY2019	tdw	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodGrantDateFairValue	19193000	USD
CY2020Q4	us-gaap	Accrued Liabilities Current AccruedLiabilitiesCurrent	52422000	USD
CY2021Q4	us-gaap	Accrued Income Taxes Current AccruedIncomeTaxesCurrent	18977000	USD
CY2020Q4	us-gaap	Accrued Income Taxes Current AccruedIncomeTaxesCurrent	23883000	USD
CY2021Q4	us-gaap	Other Sundry Liabilities Current OtherSundryLiabilitiesCurrent	4888000	USD
CY2020Q4	us-gaap	Other Sundry Liabilities Current OtherSundryLiabilitiesCurrent	8902000	USD
CY2021Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	125000000
CY2020Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	125000000
CY2021Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.001
CY2020Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.001
CY2021Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	41307617
CY2020Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	40704984
CY2021Q4	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	3000000
CY2020Q4	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	3000000
CY2021Q4	us-gaap	Preferred Stock Shares Issued PreferredStockSharesIssued	0
CY2020Q4	us-gaap	Preferred Stock Shares Issued PreferredStockSharesIssued	0
CY2021	us-gaap	Stock Repurchased During Period Shares StockRepurchasedDuringPeriodShares	0
CY2021	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	0	USD
CY2017	tdw	Class Of Warrant Or Right Issued During Period ClassOfWarrantOrRightIssuedDuringPeriod	11543814
CY2019	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	-0	USD
CY2021Q4	us-gaap	Employee Related Liabilities Current EmployeeRelatedLiabilitiesCurrent	18627000	USD
CY2020Q4	us-gaap	Employee Related Liabilities Current EmployeeRelatedLiabilitiesCurrent	17201000	USD
CY2021Q4	tdw	Accrued Vessel Expenses AccruedVesselExpenses	19662000	USD
CY2020Q4	tdw	Accrued Vessel Expenses AccruedVesselExpenses	17129000	USD
CY2021Q4	us-gaap	Interest Payable Current InterestPayableCurrent	1859000	USD
CY2020Q4	us-gaap	Interest Payable Current InterestPayableCurrent	3240000	USD
CY2021Q4	us-gaap	Other Liabilities Current OtherLiabilitiesCurrent	23865000	USD
CY2020Q4	us-gaap	Other Liabilities Current OtherLiabilitiesCurrent	32785000	USD
CY2021Q4	us-gaap	Defined Benefit Pension Plan Liabilities Noncurrent DefinedBenefitPensionPlanLiabilitiesNoncurrent	26872000	USD
CY2020Q4	us-gaap	Defined Benefit Pension Plan Liabilities Noncurrent DefinedBenefitPensionPlanLiabilitiesNoncurrent	31736000	USD
CY2021Q4	us-gaap	Liability For Uncertain Tax Positions Noncurrent LiabilityForUncertainTaxPositionsNoncurrent	29283000	USD
CY2020Q4	us-gaap	Liability For Uncertain Tax Positions Noncurrent LiabilityForUncertainTaxPositionsNoncurrent	35304000	USD
CY2021Q4	us-gaap	Other Sundry Liabilities Noncurrent OtherSundryLiabilitiesNoncurrent	12029000	USD
CY2020Q4	us-gaap	Other Sundry Liabilities Noncurrent OtherSundryLiabilitiesNoncurrent	12752000	USD
CY2021Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	68184000	USD
CY2020Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	79792000	USD
CY2021	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	371033000	USD
CY2020	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	397038000	USD
CY2019	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	486549000	USD
CY2021	us-gaap	Gain Loss On Disposition Of Assets1 GainLossOnDispositionOfAssets1	-2901000	USD
CY2020	us-gaap	Gain Loss On Disposition Of Assets1 GainLossOnDispositionOfAssets1	7591000	USD
CY2019	us-gaap	Gain Loss On Disposition Of Assets1 GainLossOnDispositionOfAssets1	2263000	USD
CY2021	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	400000	USD
CY2020	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	52981000	USD
CY2021	us-gaap	Affiliate Costs AffiliateCosts	-0	USD
CY2020	us-gaap	Affiliate Costs AffiliateCosts	2000000	USD
CY2019	us-gaap	Affiliate Costs AffiliateCosts	-0	USD
CY2021	us-gaap	Asset Impairment Charges AssetImpairmentCharges	15643000	USD
CY2020	us-gaap	Asset Impairment Charges AssetImpairmentCharges	74109000	USD
CY2019	us-gaap	Asset Impairment Charges AssetImpairmentCharges	37773000	USD
CY2021	us-gaap	Operating Income Loss OperatingIncomeLoss	-95016000	USD
CY2020	us-gaap	Operating Income Loss OperatingIncomeLoss	-186802000	USD
CY2019	us-gaap	Operating Income Loss OperatingIncomeLoss	-86604000	USD
CY2021	us-gaap	Depreciation And Amortization DepreciationAndAmortization	114544000	USD
CY2020	us-gaap	Depreciation And Amortization DepreciationAndAmortization	116709000	USD
CY2019	us-gaap	Depreciation And Amortization DepreciationAndAmortization	101931000	USD
CY2021	us-gaap	Property Plant And Equipment Additions PropertyPlantAndEquipmentAdditions	8951000	USD
CY2020	us-gaap	Property Plant And Equipment Additions PropertyPlantAndEquipmentAdditions	14900000	USD
CY2019	us-gaap	Property Plant And Equipment Additions PropertyPlantAndEquipmentAdditions	17998000	USD
CY2021Q4	us-gaap	Assets Assets	1095780000	USD
CY2020Q4	us-gaap	Assets Assets	1251177000	USD
CY2019Q4	us-gaap	Assets Assets	1579528000	USD
CY2021	tdw	Business Exit Costs And Severance Charges BusinessExitCostsAndSeveranceCharges	200000	USD
CY2020	tdw	Business Exit Costs And Severance Charges BusinessExitCostsAndSeveranceCharges	1500000	USD
CY2019	tdw	Business Exit Costs And Severance Charges BusinessExitCostsAndSeveranceCharges	6800000	USD
CY2019Q4	us-gaap	Restructuring Reserve RestructuringReserve	4381000	USD
CY2020	us-gaap	Restructuring Charges RestructuringCharges	1501000	USD
CY2020	us-gaap	Payments For Restructuring PaymentsForRestructuring	2547000	USD
CY2020Q4	us-gaap	Restructuring Reserve RestructuringReserve	3335000	USD
CY2021	us-gaap	Restructuring Charges RestructuringCharges	174000	USD
CY2021	us-gaap	Payments For Restructuring PaymentsForRestructuring	2000000	USD
CY2021Q4	us-gaap	Restructuring Reserve RestructuringReserve	1509000	USD

Files In Submission

Name	View Source	Status
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0001437749-22-005725-index.html	Edgar Link	pending
0001437749-22-005725.txt	Edgar Link	pending
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$TDW
TIDEWATER INC Stock $tdw

2021 Q4 Form 10-K Financial Statement

#000143774922005725 Filed on March 09, 2022

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

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$TDW TIDEWATER INC Stock $tdw

2021 Q4 Form 10-K Financial Statement

#000143774922005725 Filed on March 09, 2022

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$TDW
TIDEWATER INC Stock $tdw