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Income Tax (Deferred Income Tax Assets and Liabilities) (detail) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2014 | Mar. 31, 2013
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Components of Deferred Tax Assets and Liabilities [Abstract] |  |
Future tax credits | $ 3,042 | $ 2,808
Inventory valuation | 3,353 | 2,893
Employee benefits | 2,884 | 2,742
Insurance | 1,244 | 3,422
Otrher comprehensive loss | 7,194 | 14,416
Interest | 138 | 118
Deferred gain on sale/leaseback | 26 | 54
Prepaid revenue | 1,118 | 1,619
Other deferred | 859 | 232
Severance | 87 | 237
Total | 19,945 | 28,541
Property basis and depreciation difference | 10,757 | 13,274
Pension | 725 | 3,012
Total | 11,482 | 16,286
Valuation allowance - non-current | 390 | 758
Net deferred income tax asset | $ 8,073 | $ 11,497

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