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Amounts Charged to Expense Related to Defined Contribution Plans (Detail) (Defined Contribution Pension Plan 401k, USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2012
Defined Contribution Pension Plan 401k
Defined Benefit Plan Disclosure [Line Items]
Defined contribution plans expense, net of forfeitures	$ 3,854	$ 3,356	$ 3,120
Defined contribution plans forfeitures	$ 82	$ 115	$ 335

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- Definition

Defined Benefit Plan Forfeited Amounts

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No definition available.

+ Details

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Balance Type:	debit
Period Type:	duration

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- Definition

Defined Contribution Plan Expense

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No definition available.

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Name:	tdw_DefinedContributionPlanExpense
Namespace Prefix:	tdw_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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- Details

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Namespace Prefix:	us-gaap_
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Balance Type:	na
Period Type:	duration