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Income Tax (tables) | 12 Months Ended
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Mar. 31, 2013
Income Tax Disclosure [Abstract] |
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] |
7. Income Taxes |  |  |  |  |  |  |
The Company files a consolidated federal income tax return. The provision for income taxes is as follows: |
|  | 2013 |  | 2012 |  | 2011 |
|  | (In thousands) |
Current: |  |  |  |  |  |  |
Federal | $ | 21,356 | $ | 4,193 | $ | 2,854 |
State |  | 3,629 |  | 704 |  | 1,225 |
|  | 24,985 |  | 4,897 |  | 4,079 |
Deferred: |  |  |  |  |  |  |
Federal |  | (2,770) |  | 1,430 |  | 1,791 |
State |  | (180) |  | (62) |  | (74) |
|  | (2,950) |  | 1,368 |  | 1,717 |
Total income taxes | $ | 22,035 | $ | 6,265 | $ | 5,796 |
A reconciliation of the expected U.S. statutory rate to the effective rate follows: |
|  | 2013 |  | 2012 |  | 2011 |
Computed (expected tax rate) |  | 35.0 | % | 35.0 | % | 35.0 | %
State income taxes (net of federal tax benefit) |  | 3.8 |  | 4.5 |  | 3.9 |
State tax credits |  | (0.8) |  | (2.8) |  | (2.1) |
Research and development credit |  | (0.2) |  | (0.6) |  | (0.6) |
Manufacturer’s deduction |  | (3.4) |  | (5.1) |  | (3.7) |
Addition to (reversal of) uncertain tax positions |  | 0.2 |  | 0.4 |  | (7.3) |
IRS audit adjustment |  | 0.0 |  | 0.0 |  | 1.5 |
Other permanent differences not (taxable) deductible |  | 0.1 |  | 0.7 |  | (0.1) |
Tax effect of pension contribution |  | 0.0 |  | 2.2 |  | 0.0 |
Other |  | 0.0 |  | 1.5 |  | (1.9) |
Effective income tax rate |  | 34.7 | % | 35.8 | % | 24.7 | %
Schedule of Deferred Tax Assets and Liabilities [Table Text Block] |
|  | 2013 |  | 2012
|  | (In thousands)
Deferred income tax assets: |  |  |  |
Future tax credits | $ | 2,808 | $ | 3,251
Inventory valuation |  | 2,893 |  | 1,408
Employee benefits |  | 2,742 |  | 2,816
Insurance |  | 3,422 |  | 3,812
Other comprehensive loss |  | 14,416 |  | 14,867
Interest |  | 118 |  | 80
Deferred gain on sale/leaseback |  | 54 |  | 82
Prepaid revenue |  | 1,619 |  | 2,348
Other |  | 232 |  | 520
Severance |  | 237 |  | 196
|  | 28,541 |  | 29,380
Deferred income tax liabilities: |  |  |  |
Property basis and depreciation difference |  | 13,274 |  | 14,151
Pension |  | 3,012 |  | 5,283
|  | 16,286 |  | 19,434
Valuation allowance - non-current |  | 758 |  | 906
Net deferred income tax asset | $ | 11,497 | $ | 9,040
Summary of Income Tax Contingencies [Table Text Block] |
|  | 2013 |  | 2012
|  | (In thousands)
Beginning balance | $ | 2,350 | $ | 2,174
Tax positions related to current year: |  |  |  |
Additions |  | 176 |  | 207
Tax positions related to prior years: |  |  |  |
Additions |  | 70 |  | 133
Reductions |  | (45) |  | (27)
Settlements |  | (81) |  | (137)
Balance as of March 31, | $ | 2,470 | $ | 2,350

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- Definition Tabular disclosure of the components of net deferred tax asset or liability recognized in an entity's statement of financial position, including the following: the total of all deferred tax liabilities, the total of all deferred tax assets, the total valuation allowance recognized for deferred tax assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319 + Details
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- Definition Tabular disclosure of the reconciliation using percentage or dollar amounts of the reported amount of income tax expense attributable to continuing operations for the year to the amount of income tax expense that would result from applying domestic federal statutory tax rates to pretax income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 + Details
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- Definition Tabular disclosure of tax positions taken in the tax returns filed or to be filed for which it is more likely than not that the tax position will not be sustained upon examination by taxing authorities (i.e., uncertain tax positions) and other types of income tax contingencies, including: (1) the policy on classification of interest and penalties; (2) a tabular reconciliation of the total amounts of unrecognized tax benefits at the beginning and end of the period; the total amount(s) of: (3) unrecognized tax benefits that, if recognized, would affect the effective tax rate, and (4) interest and penalties recognized in each of the income statement and balance sheet; (5) for positions for which it is reasonably possible that the total amounts unrecognized will significantly change within 12 months of the reporting date the: (i) nature of the uncertainty, (ii) nature of the event that could occur that would cause the change, and (iii) an estimate of the range of the reasonably possible change or a statement that an estimate of the range cannot be made; and (6) a description of tax years that remain subject to examination by major tax jurisdictions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32718-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Interpretation (FIN) -Number 48 -Paragraph 21 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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