XML 83 R69.htm IDEA: XBRL DOCUMENT
v3.4.0.3

Indebtedness - Senior Debt Notes - Additional Information (Detail) $ in Thousands, NOK in Millions |  |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Nov. 15, 2013 USD ($) | Sep. 30, 2013 USD ($) | Aug. 15, 2011 USD ($) | May. 27, 2015 USD ($) | Mar. 31, 2015 USD ($) | Jan. 31, 2014 USD ($) | May. 31, 2012 NOK | Jul. 31, 2003 USD ($) | Sep. 30, 2014 USD ($) | Sep. 30, 2014 NOK | Mar. 31, 2016 USD ($) Trom | Mar. 31, 2015 USD ($) | Mar. 31, 2014 USD ($) | Mar. 31, 2011 USD ($) | Mar. 31, 2016 NOK Trom | Jan. 31, 2014 NOK
Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument outstanding amount |  |  |  |  |  | $ 1,534,476 |  |  |  |  |  | $ 2,052,270 | $ 1,534,476 |  |  |  |
Loss on early extinguishment of debt |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (4,144) |  |  |
Troms Offshore Supply AS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Troms Offshore Debt tranches | Trom |  |  |  |  |  |  |  |  |  |  |  | 4 |  |  |  | 4 |
Notes Due April 2027 | Troms Offshore Supply AS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument maturity, month and year |  |  |  |  | 2027-04 |  |  |  |  |  |  |  |  |  |  |  |
Debt instruments face amount |  |  |  |  | $ 31,300 |  |  |  |  |  |  |  |  |  |  |  |
Semi-annual principal payments |  |  |  |  | $ 1,300 |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument bearing floating interest rate |  |  |  |  | 2.92% |  |  |  |  |  |  |  |  |  |  |  |
Indebtedness rate |  |  |  |  | 1.30% |  |  |  |  |  |  |  |  |  |  |  |
Total capitalization rate |  |  |  |  | 4.22% |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument outstanding amount | [1] |  |  |  |  |  |  |  |  |  |  | $ 30,033 |  |  |  |  |
Notes Due January 2027 | Troms Offshore Supply AS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument maturity, month and year |  |  |  |  |  | 2027-01 |  |  |  |  |  |  |  |  |  |  |
Debt instruments face amount |  |  |  |  |  | $ 29,500 |  |  |  |  |  |  | $ 29,500 |  |  |  |
Semi-annual principal payments |  |  |  |  |  | $ 1,200 |  |  |  |  |  |  |  |  |  |  |
Debt instrument bearing floating interest rate |  |  |  |  |  | 2.91% |  |  |  |  |  |  | 2.91% |  |  |  |
Indebtedness rate |  |  |  |  |  | 1.30% |  |  |  |  |  |  |  |  |  |  |
Total capitalization rate |  |  |  |  |  | 4.21% |  |  |  |  |  |  | 4.21% |  |  |  |
Debt instrument outstanding amount | [1] |  |  |  |  | $ 29,488 |  |  |  |  |  | 27,030 | $ 29,488 |  |  |  |
Notes Due January 2026 | Troms Offshore Supply AS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument maturity, month and year |  |  |  |  |  |  | 2026-01 |  |  |  |  |  |  |  |  |  |
Debt instruments face amount | NOK |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | NOK 300.0
Semi-annual principal payments |  |  |  |  |  |  | $ 12,500 |  |  |  |  |  |  |  |  |  |
Indebtedness rate |  |  |  |  |  |  | 1.50% |  |  |  |  |  |  |  |  |  |
Total capitalization rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.81%
Debt instrument outstanding amount |  |  |  |  |  |  |  |  |  |  |  | 30,200 |  |  |  | NOK 250.0 |
Notes Due May 2024 | Troms Offshore Supply AS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument maturity, month and year |  |  |  |  |  |  |  | 2024-05 |  |  |  |  |  |  |  |  |
Debt instruments face amount | NOK |  |  |  |  |  |  |  | NOK 204.4 |  |  |  |  |  |  |  |  |
Semi-annual principal payments | NOK |  |  |  |  |  |  |  | NOK 8.5 |  |  |  |  |  |  |  |  |
Indebtedness rate |  |  |  |  |  |  | 1.50% |  |  |  |  |  |  |  |  |  |
Total capitalization rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5.38%
Debt instrument outstanding amount |  |  |  |  |  |  |  |  |  |  |  | $ 17,500 |  |  |  | NOK 144.8 |
Debt instrument bearing interest rate |  |  |  |  |  |  |  | 6.38% |  |  |  |  |  |  |  |  | 3.88%
Public bonds | Troms Offshore Supply AS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt extinguished amount |  |  |  |  |  |  |  |  |  | $ 82,100 | NOK 500.0 |  |  |  |  |  |
Repayment of bond at average price as a percentage of par value |  |  |  |  |  |  |  |  |  | 105.00% | 105.00% |  |  |  |  |  |
Loss on early extinguishment of debt |  |  |  |  |  |  |  |  |  | $ (4,100) | NOK (26.0) |  |  |  |  |  |
Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest coverage ratio |  |  |  |  |  |  |  |  |  |  |  | 300.00% |  |  |  | 300.00% |
Minimum | Troms Offshore Supply AS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest coverage ratio |  |  |  |  |  |  |  |  |  |  |  | 300.00% |  |  |  | 300.00% |
Minimum | Notes Due January 2026 | Troms Offshore Supply AS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument bearing floating interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.31%
Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consolidated debt to consolidated total capitalization, ratio |  |  |  |  |  |  |  |  |  |  |  | 55.00% |  |  |  |  |
Maximum | Troms Offshore Supply AS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consolidated debt to consolidated total capitalization, ratio |  |  |  |  |  |  |  |  |  |  |  | 55.00% |  |  |  |  |
September 2013 Senior Unsecured Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Senior note issuable amount under purchase agreement |  |  | $ 500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of debt outstanding |  | $ 200,000 | $ 300,000 |  |  |  |  |  |  |  |  | $ 500,000 |  |  |  |  |
September 2013 Senior Unsecured Notes | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument maturity, in years |  |  |  |  |  |  |  |  |  |  |  | 7 years |  |  |  |  |
Interest coverage ratio |  |  |  |  |  |  |  |  |  |  |  | 300.00% |  |  |  | 300.00% |
September 2013 Senior Unsecured Notes | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument maturity, in years |  |  |  |  |  |  |  |  |  |  |  | 12 years |  |  |  |  |
Consolidated debt to consolidated total capitalization, ratio |  |  |  |  |  |  |  |  |  |  |  | 55.00% |  |  |  |  |
August 2011 Senior Unsecured Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of debt outstanding |  |  |  | $ 165,000 |  |  |  |  |  |  |  |  |  |  |  |  |
August 2011 Senior Unsecured Notes | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument maturity, in years |  |  |  |  |  |  |  |  |  |  |  | 8 years |  |  |  |  |
August 2011 Senior Unsecured Notes | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument maturity, in years |  |  |  |  |  |  |  |  |  |  |  | 10 years |  |  |  |  |
Consolidated debt to consolidated total capitalization, ratio |  |  |  |  |  |  |  |  |  |  |  | 55.00% |  |  |  |  |
September 2010 Senior Unsecured Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of debt outstanding |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 425,000 |  |
After-tax loss relating to interest rate hedges |  |  |  |  |  |  |  |  |  |  |  | $ 1,500 | 1,800 |  |  |  |
Pre-tax loss relating to interest rate hedges |  |  |  |  |  |  |  |  |  |  |  | $ 2,400 | $ 2,600 |  |  |  |
September 2010 Senior Unsecured Notes | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument maturity, in years |  |  |  |  |  |  |  |  |  |  |  | 5 years |  |  |  |  |
September 2010 Senior Unsecured Notes | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument maturity, in years |  |  |  |  |  |  |  |  |  |  |  | 12 years |  |  |  |  |
Consolidated debt to consolidated total capitalization, ratio |  |  |  |  |  |  |  |  |  |  |  | 55.00% |  |  |  |  |
July 2003 Senior Unsecured Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of debt outstanding |  |  |  |  |  |  |  |  | $ 300,000 |  |  |  |  |  |  |  |
July 2003 Senior Unsecured Notes | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument maturity, in years |  |  |  |  |  |  |  |  |  |  |  | 7 years |  |  |  |  |
July 2003 Senior Unsecured Notes | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument maturity, in years |  |  |  |  |  |  |  |  |  |  |  | 12 years |  |  |  |  |
Consolidated debt to consolidated total capitalization, ratio |  |  |  |  |  |  |  |  |  |  |  | 55.00% |  |  |  |  |
[1] | Note requires semi-annual principal payments.

X
- Definition Capitalization Rate + References No definition available. + Details
Name: | tdw_CapitalizationRate
Namespace Prefix: | tdw_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Consolidated debt as percentage of capitalization. + References No definition available. + Details
Name: | tdw_ConsolidatedDebtAsPercentageOfCapitalization
Namespace Prefix: | tdw_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Debt Instrument Aggregate Rate + References No definition available. + Details
Name: | tdw_DebtInstrumentAggregateRate
Namespace Prefix: | tdw_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Debt Instrument, Maturity, Month and Year + References No definition available. + Details
Name: | tdw_DebtInstrumentMaturityMonthAndYear
Namespace Prefix: | tdw_
Data Type: | xbrli:gYearMonthItemType
Balance Type: | na
Period Type: | duration

X
- Definition Interest Coverage ratio + References No definition available. + Details
Name: | tdw_InterestCoverageRatio
Namespace Prefix: | tdw_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Long Term Debt Average Price Percentage Of Par Value + References No definition available. + Details
Name: | tdw_LongTermDebtAveragePricePercentageOfParValue
Namespace Prefix: | tdw_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Notes Issuable In Exchange, Face Amount + References No definition available. + Details
Name: | tdw_NotesIssuableInExchangeFaceAmount
Namespace Prefix: | tdw_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Number of Troms Offshore Debt tranches. + References No definition available. + Details
Name: | tdw_NumberOfTromsOffshoreDebtTranches
Namespace Prefix: | tdw_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=34725769&loc=d3e28878-108400 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 + Details
Name: | us-gaap_DebtInstrumentFaceAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_DebtInstrumentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of the required periodic payments applied to principal. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_DebtInstrumentPeriodicPaymentPrincipal
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
Name: | us-gaap_DebtInstrumentTerm
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 50 -Section 40 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=49170532&loc=d3e12317-112629 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 50 -Section 40 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=49170532&loc=d3e12355-112629 + Details
Name: | us-gaap_GainsLossesOnExtinguishmentOfDebt
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20, 22 -Article 5 + Details
Name: | us-gaap_LongTermDebt
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The interest rate applicable to the portion of the carrying amount of long-term borrowings outstanding as of the balance sheet date, including current maturities, which accrues interest at a set, unchanging rate. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_LongTermDebtPercentageBearingFixedInterestRate
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition The interest rate applicable to the portion of the carrying amount of long-term borrowings outstanding as of the balance sheet date, including current maturities, which accrues interest at a rate subject to change from time to time. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_LongTermDebtPercentageBearingVariableInterestRate
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Amount before tax, after reclassification adjustments, of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=36458714&loc=SL7669646-108580 + Details
Name: | us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesBeforeTax
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount after tax and reclassification adjustments, of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=36458714&loc=SL7669646-108580 + Details
Name: | us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The cash inflow from the issuance of long-term debt that is not secured by collateral. Excludes proceeds from tax exempt unsecured debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3255-108585 + Details
Name: | us-gaap_ProceedsFromIssuanceOfUnsecuredDebt
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The cash outflow to repay long-term debt that is wholly or partially secured by collateral. Excludes repayments of tax exempt secured debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3291-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
Name: | us-gaap_RepaymentsOfSecuredDebt
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | dei_LegalEntityAxis=tdw_TromsOffshoreSupplyAsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=tdw_SeniorNotesDueInAprilTwentyTwentySevenMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=tdw_SeniorNotesDueInJanuaryTwentyTwentySevenMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=tdw_SeniorNotesDueTwentyTwentySixMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=tdw_SeniorNotesDueTwentyTwentyFourMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=us-gaap_BondsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=tdw_SeptemberTwoThousandThirteenSeniorUnsecuredNotesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=tdw_AugustTwoThousandElevenSeniorUnsecuredNotesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=tdw_SeptemberTwentyTenSeniorUnsecuredNotesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=tdw_JulyTwoThousandThreeSeniorUnsecuredNotesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |