XML 1071 R136.htm IDEA: XBRL DOCUMENT v2.4.1.9

Fair Value Measurements and Disclosures - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Mar. 31, 2015 Contract	Mar. 31, 2014 Contract
Derivatives, Fair Value [Line Items]
Cash equivalents maturity period, days	90 days
Number of contracts outstanding	2us-gaap_DerivativeNumberOfInstrumentsHeld	4us-gaap_DerivativeNumberOfInstrumentsHeld
Notional value of foreign exchange contract	$ 2.3tdw_NotionalValueEquivalentOfForwardContract	$ 2.3tdw_NotionalValueEquivalentOfForwardContract

X

- Definition

Notional Value Equivalent of Forward Contract

+ References

No definition available.

+ Details

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Namespace Prefix:	tdw_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Short Term Deposits Maximum Maturity Period

+ References

No definition available.

+ Details

Name:	tdw_ShortTermDepositsMaximumMaturityPeriod
Namespace Prefix:	tdw_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The number of derivative instruments of a particular group held by the entity.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 1B

-URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5580258-113959



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 1A

-Subparagraph (d)

-URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5579245-113959

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Balance Type:	na
Period Type:	instant

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- Details

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Balance Type:	na
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