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Schedule of Other Assets (Detail) - USD ($) $ in Thousands | Jun. 30, 2015 | Mar. 31, 2015
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Other Assets, Accrued Expenses, Other Current Liabilities, And Other Liabilities And Deferred Credits [Abstract] |  |
Recoverable insurance losses | $ 9,660 | $ 10,468
Deferred income tax assets | 21,282 | 19,004
Deferred finance charges - revolver | 7,913 | 7,396
Savings plans and supplemental plan | 22,808 | 23,208
Vessel construction contract refunds | 19,486 |
Other | 15,616 | 15,120
Total other assets | $ 96,765 | $ 75,196

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