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Commitments and Contingencies (Brazilian Customs) - Additional Information (Detail) In Millions, unless otherwise specified | 1 Months Ended | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended
--- | --- | --- | --- | --- | ---
Apr. 30, 2011 BRL Vessel | Sep. 30, 2014 USD ($) | Sep. 30, 2014 USD ($) | Sep. 30, 2014 BRL | Sep. 30, 2014 Revised USD ($) | Sep. 30, 2014 Revised BRL
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |
Fines assessed | 155.0 |  | $ 63.6 |  | $ 52.1 | 127.0
Number of Tidewater vessels that the subsidiaries failed to obtain import licenses from | 17 |  |  |  |  |
Disallowed amount of total fines by the administrative appeals board |  | 61.1 |  | 149.0 |  |
Remaining amount of fines contested |  | 11.5 |  | 28.0 |  |
Decision disallowing the fines totaling |  |  |  | 127.0 |  |

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- Definition Amount Of Fines Disallowed By Administrative Appeals Board + References No definition available. + Details
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- Definition Assessed Fine + References No definition available. + Details
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- Details
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- Definition Number Of Vessels That The Subsidiaries Failed To Obtain Import Licenses From + References No definition available. + Details
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