XML 65 R54.htm IDEA: XBRL DOCUMENT v3.7.0.1

Summary of Debt Outstanding (Parenthetical) (Detail) - USD ($)	Jun. 30, 2017	Mar. 31, 2017
Term loan, revolving line of credit and senior notes | Level 2
Debt [Line Items]
Fair value of debt	$ 1,100,000,000	$ 1,100,000,000
Troms Offshore borrowings | Level 2
Debt [Line Items]
Fair value of debt	$ 91,700	$ 92,900
May 2015 4.42% Notes
Debt [Line Items]
Debt instrument interest rate	4.42%	4.42%
March 2015 4.41% Notes
Debt [Line Items]
Debt instrument interest rate	4.41%	4.41%
January 2014 4.31% notes
Debt [Line Items]
Debt instrument interest rate	4.31%	4.31%
May 2012 5.88% notes
Debt [Line Items]
Debt instrument interest rate	5.88%	5.88%

X

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ 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_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
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

Fair value portion of contractual arrangement with a lender under which borrowings can be made up to a specific amount at any point in time.

+ References

No definition available.

+ Details

Name:	us-gaap_LinesOfCreditFairValueDisclosure
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

Name:	us-gaap_CreditFacilityAxis=tdw_TermLoanRevolvingLineOfCreditAndSeniorNotesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel2Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_CreditFacilityAxis=tdw_TromsOffshoreSupplyAsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_LongtermDebtTypeAxis=tdw_MayTwoThousandFifteenAndFourPointFortyTwoPercentUnitedStatesDollarDenominatedBorrowingAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_LongtermDebtTypeAxis=tdw_MarchTwoThousandFifteenAndFourPointFortyOnePercentUnitedStatesDollarDenominatedBorrowingAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DebtInstrumentAxis=tdw_NotesPayableOneMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DebtInstrumentAxis=tdw_NotesPayableTwoMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: