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Nature of Operations and Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Mar. 31, 2016
Accounting Policies [Abstract] |
Summary of Net Properties and Equipment | The following is a summary of net properties and equipment at March 31:
|  | 2016 |  |  | 2015 |
|  | Number Of Vessels |  |  | Carrying Value |  |  | Number Of Vessels |  |  | Carrying Value |
|  |  |  |  |  | (In thousands) |  |  |  |  |  |  | (In thousands) |
Owned vessels in active service |  |  | 180 |  |  | $ | 2,510,418 |  |  |  | 242 |  |  | $ | 3,310,476 |
Stacked vessels |  |  | 73 |  |  |  | 794,126 |  |  |  | 21 |  |  |  | 38,489 |
Marine equipment and other assets under construction |  |  |  |  |  |  | 185,380 |  |  |  |  |  |  |  | 315,552 |
Other property and equipment (A) |  |  |  |  |  |  | 61,367 |  |  |  |  |  |  |  | 81,790 |
Totals |  |  | 253 |  |  | $ | 3,551,291 |  |  |  | 263 |  |  | $ | 3,746,307 |
Current and Long-Term Liabilities Related to Accrued Property and Liability Losses | The following table discloses the total amount of current and long-term liabilities related to accrued property and liability losses not subject to reinsurance recoverability, but considered currently payable as of March 31:
(In thousands) |  | 2016 |  |  | 2015 |
Accrued property and liability losses |  | $ | 12,799 |  |  |  | 14,203 |

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- Definition Tabular disclosure of physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, balances by class of assets, depreciation and depletion expense and method used, including composite depreciation, and accumulated deprecation. + 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 210.5-02.13) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 13 -Subparagraph b -Article 5 + Details
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