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Schedule of Tax Benefit from Stock Benefit Transactions (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014 | Mar. 31, 2013
Income Taxes [Line Items] |  |  |
Excess tax benefits on stock benefit transactions | $ (1,784)us-gaap_DeferredTaxExpenseFromStockOptionsExercised | $ 301 us-gaap_DeferredTaxExpenseFromStockOptionsExercised | $ 359 us-gaap_DeferredTaxExpenseFromStockOptionsExercised

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- Details
Name: | tdw_IncomeTaxesLineItems
Namespace Prefix: | tdw_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of deferred tax expense from write-off of the deferred tax asset related to deductible stock options at exercise. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 20 -Section 55 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=32706628&loc=d3e11283-113907 + Details
Name: | us-gaap_DeferredTaxExpenseFromStockOptionsExercised
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration