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v2.4.1.9

Indebtedness - Revolving Credit and Term Loan Agreement - Additional Information (Detail) (USD $) | 12 Months Ended
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Mar. 31, 2015
Minimum |
Debt [Line Items] |
Interest coverage ratio | 300.00%tdw_InterestCoverageRatio / us-gaap_RangeAxis = us-gaap_MinimumMember
Commitment fees on the unused portion of credit facility | 0.15%us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage / us-gaap_RangeAxis = us-gaap_MinimumMember
Maximum |
Debt [Line Items] |
Consolidated debt to consolidated total capitalization, ratio | 55.00%tdw_ConsolidatedDebtAsPercentageOfTotalCapitalization / us-gaap_RangeAxis = us-gaap_MaximumMember
Commitment fees on the unused portion of credit facility | 0.30%us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage / us-gaap_RangeAxis = us-gaap_MaximumMember
Eurodollar Rates | Minimum |
Debt [Line Items] |
Revolving credit rate | 1.25%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_VariableRateAxis = us-gaap_EurodollarMember
Eurodollar Rates | Maximum |
Debt [Line Items] |
Revolving credit rate | 2.00%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_VariableRateAxis = us-gaap_EurodollarMember
Current Credit Facility |
Debt [Line Items] |
Credit facility expiration date | 2018-06
Revolving credit facility | 900,000,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_LineOfCreditFacilityAxis = tdw_CurrentCreditFacilityMember
Credit facility term | 5 years
Revolving line of credit | 600,000,000 tdw_LineOfCreditFacilityRevolvingLineOfCredit / us-gaap_LineOfCreditFacilityAxis = tdw_CurrentCreditFacilityMember
Term loan | 300,000,000 tdw_LineOfCreditFacilityTermLoan / us-gaap_LineOfCreditFacilityAxis = tdw_CurrentCreditFacilityMember
Revolving credit facility, remaining borrowing capacity | 580,000,000 us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity / us-gaap_LineOfCreditFacilityAxis = tdw_CurrentCreditFacilityMember
Prime or Federal Funds | Minimum |
Debt [Line Items] |
Revolving credit rate | 0.25%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_LineOfCreditFacilityAxis = tdw_PrimeOrFederalFundsMember / us-gaap_RangeAxis = us-gaap_MinimumMember
Prime or Federal Funds | Maximum |
Debt [Line Items] |
Revolving credit rate | 1.00%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_LineOfCreditFacilityAxis = tdw_PrimeOrFederalFundsMember / us-gaap_RangeAxis = us-gaap_MaximumMember
Term Loan Facility |
Debt [Line Items] |
Outstanding borrowing | 300,000,000 us-gaap_LineOfCredit / us-gaap_LineOfCreditFacilityAxis = tdw_TermLoanFacilityMember
Revolving Credit Agreement |
Debt [Line Items] |
Outstanding borrowing | 20,000,000 us-gaap_LineOfCredit / us-gaap_LineOfCreditFacilityAxis = tdw_RevolvingCreditAgreementMember

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- Definition Consolidated Debt As Percentage Of Total Capitalization + References No definition available. + Details
Name: | tdw_ConsolidatedDebtAsPercentageOfTotalCapitalization
Namespace Prefix: | tdw_
Data Type: | num:percentItemType
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 Line of Credit Facility Expiration Dates + References No definition available. + Details
Name: | tdw_LineOfCreditFacilityExpirationDates
Namespace Prefix: | tdw_
Data Type: | xbrli:gYearMonthItemType
Balance Type: | na
Period Type: | duration

X
- Definition Line of credit facility, revolving line of credit + References No definition available. + Details
Name: | tdw_LineOfCreditFacilityRevolvingLineOfCredit
Namespace Prefix: | tdw_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Line of credit facility, term loan + References No definition available. + Details
Name: | tdw_LineOfCreditFacilityTermLoan
Namespace Prefix: | tdw_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
Name: | us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_DebtInstrumentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + 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 SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20, 22 -Article 5 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 + Details
Name: | us-gaap_LineOfCredit
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Period remaining on line of credit facility before it terminates, 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_LineOfCreditFacilityExpirationPeriod
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + 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 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
Name: | us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding). + 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 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
Name: | us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility. + References No definition available. + Details
Name: | us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_LineOfCreditFacilityAxis=tdw_CurrentCreditFacilityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_LineOfCreditFacilityAxis=tdw_PrimeOrFederalFundsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_LineOfCreditFacilityAxis=tdw_RevolvingCreditAgreementMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

X
- Details
Name: | us-gaap_VariableRateAxis=us-gaap_EurodollarMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |