Indebtedness - Revolving Credit and Term Loan Agreement - Additional Information (Detail) (USD $)	12 Months Ended
Mar. 31, 2014	Mar. 31, 2013
Debt [Line Items]
Revolving line of credit		$ 110,000,000
Term loan	300,000,000	125,000,000
Minimum
Debt [Line Items]
Interest coverage ratio	300.00%
Commitment fees on the unused portion of credit facility	0.15%
Maximum
Debt [Line Items]
Consolidated debt to consolidated total capitalization, ratio	55.00%
Commitment fees on the unused portion of credit facility	0.30%
Current Credit Facility
Debt [Line Items]
Credit facility expiration date	2018-06
Revolving credit facility	900,000,000
Credit facility term	5 years
Revolving line of credit	600,000,000
Term loan	300,000,000
Revolving credit facility, remaining borrowing capacity	600,000,000
Prime or Federal Funds \| Minimum
Debt [Line Items]
Revolving credit rate	0.25%
Prime or Federal Funds \| Maximum
Debt [Line Items]
Revolving credit rate	1.00%
Eurodollar Rates \| Minimum
Debt [Line Items]
Revolving credit rate	1.25%
Eurodollar Rates \| Maximum
Debt [Line Items]
Revolving credit rate	2.00%
Term Loan Facility
Debt [Line Items]
Outstanding borrowing	300,000,000
Term loan facility, current borrowing capacity		125,000,000
Revolving Credit Agreement
Debt [Line Items]
Outstanding borrowing		$ 110,000,000

Consolidated Debt As Percentage Of Total Capitalization

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- Definition

Interest Coverage ratio

+ References

No definition available.

+ Details

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- Definition

Line of Credit Facility Expiration Dates

+ References

No definition available.

+ Details

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- Definition

Line of credit facility, revolving line of credit

+ References

No definition available.

+ Details

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Namespace Prefix:	tdw_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Line of credit facility, term loan

+ References

No definition available.

+ Details

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Balance Type:	credit
Period Type:	duration

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

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- Details

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- Definition

Amount borrowed under the credit facility as of the balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 22

-Article 5

+ Details

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- Definition

Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any 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

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- 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

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- 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

+ Details

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Balance Type:	credit
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- Definition

Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

+ References

+ Details

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Period Type:	instant

- 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

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