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Gain on Disposition of Assets, Net - Additional Information (Detail) - USD ($) $ in Millions | 12 Months Ended
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Mar. 31, 2017 | Mar. 31, 2016 | Mar. 31, 2015
Gain Loss On Disposition Of Assets [Abstract] |  |  |
Amortized gains on sale/leaseback transactions | $ 23.4 | $ 23.4 | $ 17.7
Reversal of accrued liability |  |  | $ 3.0

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- Definition Disposal Group, Including Discontinued Operation, Gain (Loss) on Reversal of Accrued Liabilities + References No definition available. + Details
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Namespace Prefix: | tdw_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The portion of the deferred gain that was recognized in the current period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 40 -Section 35 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35688829&loc=d3e50609-112754 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration