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Schedule of Carrying Value of Trust Assets, Including Unrealized Gains or Losses (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Defined Benefit Plan Disclosure [Line Items]
Investments held in Rabbi Trust	$ 9,915us-gaap_DeferredCompensationPlanAssets	$ 10,285us-gaap_DeferredCompensationPlanAssets
Unrealized (loss) gains in carrying value of trust assets	235tdw_TrustAssetsCarryingValueNet	92tdw_TrustAssetsCarryingValueNet
Unrealized (loss) gains in carrying value of trust assets are net of income tax expense of	126tdw_TrustAssetsCarryingValueIncomeTaxExpense	49tdw_TrustAssetsCarryingValueIncomeTaxExpense
Obligations under the supplemental plan	$ 25,510tdw_DefinedBenefitPlanSupplementalPlanObligations	$ 21,918tdw_DefinedBenefitPlanSupplementalPlanObligations

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- Definition

Defined Benefit Plan Supplemental Plan Obligations

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- Definition

Trust assets, carrying value, income tax expense

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- Definition

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- Definition

Carrying amount as of the balance sheet date of assets held under deferred compensation agreements.

+ 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 210.5-02.17)

-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 17

-Article 5

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