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Income Tax (Deferred Income Tax Assets and Liabilities) (detail) - USD ($) | Mar. 31, 2016 | Mar. 31, 2015
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Components of Deferred Tax Assets and Liabilities [Abstract] |  |
Future tax credits | $ 3,807,000 | $ 4,021,000
Inventory valuation | 0 | 2,348,000
Employee benefits | 3,174,000 | 3,009,000
Insurance | 881,000 | 816,000
Otrher comprehensive loss | 18,154,000 | 20,335,000
Interest | 21,000 | 46,000
Defined benefit plan |  | 1,372,000
Prepaid revenue | 571,000 | 701,000
Other deferred | 2,804,000 | 1,364,000
Severance | 3,000 | 256,000
Total | 29,415,000 | 34,268,000
Property basis and depreciation difference | 9,330,000 | 9,129,000
481 (a) adjustment | 880,000 | 1,281,000
Income from Equity Investment | 69,000 | 245,000
Inventory valuation | 1,247,000 |
Intangibles | 235,000 |
Pension | 2,896,000 |
Total | 14,657,000 | 10,655,000
Valuation allowance - non-current | 1,861,000 | 1,787,000
Net deferred income tax asset | $ 12,897,000 | $ 21,826,000

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