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Income Tax (Deferred Income Tax Assets and Liabilities) (detail) - USD ($) | Mar. 31, 2017 | Mar. 31, 2016
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Components of Deferred Tax Assets and Liabilities [Abstract] |  |
Future tax credits | $ 3,827,000 | $ 3,807,000
Inventory valuation | 0 | 0
Employee benefits | 3,119,000 | 3,174,000
Insurance | 924,000 | 881,000
Otrher comprehensive loss | 7,135,000 | 18,154,000
Interest | 32,000 | 21,000
Defined benefit plan |  | 0
Prepaid revenue | 444,000 | 571,000
Other deferred | 472,000 | 2,804,000
Severance | 0 | 3,000
Total | 15,953,000 | 29,415,000
Property basis and depreciation difference | 12,786,000 | 9,330,000
481 (a) adjustment | 429,000 | 880,000
Income from Equity Investment | 193,000 | 69,000
Inventory valuation | 1,032,000 | 1,247,000
Intangibles | 213,000 | 235,000
Pension | 3,590,000 | 2,896,000
Total | 18,243,000 | 14,657,000
Valuation allowance - non-current | 1,891,000 | 1,861,000
Net deferred income tax asset | $ (4,181,000) | $ 12,897,000

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