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Income Tax (Deferred Income Tax Assets and Liabilities) (detail) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2013 | Mar. 31, 2012
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Components of Deferred Tax Assets and Liabilities [Abstract] |  |
Future tax credits | $ 2,808 | $ 3,251
Inventory valuation | 2,893 | 1,408
Employee benefits | 2,742 | 2,816
Insurance | 3,422 | 3,812
Otrher comprehensive loss | 14,416 | 14,867
Interest | 118 | 80
Deferred gain on sale/leaseback | 54 | 82
Prepaid revenue | 1,619 | 2,348
Other deferred | 232 | 520
Severance | 237 | 196
Total | 28,541 | 29,380
Property basis and depreciation difference | 13,274 | 14,151
Pension | 3,012 | 5,283
Total | 16,286 | 19,434
Valuation allowance - non-current | 758 | 906
Net deferred income tax asset | $ 11,497 | $ 9,040

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