Income Taxes	3 Months Ended
Apr. 30, 2013
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes Income tax expense (benefit) for the three months ended April 30, 2013 and 2012 was $(15,222,000) and $9,848,000, respectively. The difference in the recorded income tax expense/benefit versus the income tax expense/benefit computed at the statutory federal income tax rate is primarily attributable to state income taxes, changes in state net operating losses, additional general business credits, changes to the valuation allowances associated with certain deferred tax assets, and various permanent differences between pre-tax GAAP income and taxable income. The Company applies an estimated annual effective tax rate to its year-to-date earnings from operations to derive its tax provision for the quarter. Certain circumstances may arise which make it difficult for the Company to determine a reasonable estimate of its annual effective tax rate for the year. The Company’s projected marginal operating results, which include the gain related to the Commercial Group’s land sales as described in Note H – Commercial Group Land Sale, result in an effective tax rate that changes significantly with small variations in projected income or loss from operations or permanent differences and thus does not provide for a reliable estimate of the estimated annual effective tax rate. Therefore, in computing the Company’s income tax provision for the three months ended April 30, 2012, the Company has excluded the gain on the Commercial Group’s land sales from its estimated annual effective tax rate calculation and has recognized the actual income tax expense related to the gain during the three months ended April 30, 2012. At January 31, 2013, the Company had a federal net operating loss carryforward for tax purposes of $212,271,000 that will expire in the years ending January 31, 2026 through January 31, 2033, a charitable contribution deduction carryforward of $27,326,000 that will expire in the years ending January 31, 2014 through January 31, 2018, general business credit carryovers of $21,159,000 that will expire in the years ending January 31, 2019 through January 31, 2033, and an alternative minimum tax (“AMT”) credit carryforward of $27,452,000 that is available until used to reduce federal tax to the AMT amount. The Company’s policy is to consider a variety of tax-deferral strategies, including tax deferred exchanges, when evaluating its future tax position. The Company has a full valuation allowance against the deferred tax asset associated with its charitable contributions. The Company has a valuation allowance against its general business credits, other than those general business credits which are eligible to be utilized to reduce future AMT liabilities. The Company has a valuation allowance against certain of its state net operating losses and state bonus depreciation deferred assets. These valuation allowances exist because management believes it is more likely than not that the Company will not realize these benefits. The Company applies the “with-and-without” methodology for recognizing excess tax benefits from the deduction of stock-based compensation. The net operating loss available for the tax return, as is noted in the paragraph above, is greater than the net operating loss available for the tax provision due to excess deductions from stock-based compensation reported on the return, as well as the impact of adjustments to the net operating loss under accounting guidance on accounting for uncertainty in income taxes. As of January 31, 2013, the Company has not recorded a net deferred tax asset of approximately $17,299,000 from excess stock-based compensation deductions taken on the tax return for which a benefit has not yet been recognized in the Company’s tax provision.

Income Taxes

Income tax expense (benefit) for the three months ended April 30, 2013 and 2012 was $(15,222,000) and $9,848,000, respectively. The difference in the recorded income tax expense/benefit versus the income tax expense/benefit computed at the statutory federal income tax rate is primarily attributable to state income taxes, changes in state net operating losses, additional general business credits, changes to the valuation allowances associated with certain deferred tax assets, and various permanent differences between pre-tax GAAP income and taxable income.

The Company applies an estimated annual effective tax rate to its year-to-date earnings from operations to derive its tax provision for the quarter. Certain circumstances may arise which make it difficult for the Company to determine a reasonable estimate of its annual effective tax rate for the year. The Company’s projected marginal operating results, which include the gain related to the Commercial Group’s land sales as described in Note H – Commercial Group Land Sale, result in an effective tax rate that changes significantly with small variations in projected income or loss from operations or permanent differences and thus does not provide for a reliable estimate of the estimated annual effective tax rate. Therefore, in computing the Company’s income tax provision for the three months ended April 30, 2012, the Company has excluded the gain on the Commercial Group’s land sales from its estimated annual effective tax rate calculation and has recognized the actual income tax expense related to the gain during the three months ended April 30, 2012.

At January 31, 2013, the Company had a federal net operating loss carryforward for tax purposes of $212,271,000 that will expire in the years ending January 31, 2026 through January 31, 2033, a charitable contribution deduction carryforward of $27,326,000 that will expire in the years ending January 31, 2014 through January 31, 2018, general business credit carryovers of $21,159,000 that will expire in the years ending January 31, 2019 through January 31, 2033, and an alternative minimum tax (“AMT”) credit carryforward of $27,452,000 that is available until used to reduce federal tax to the AMT amount.

The Company’s policy is to consider a variety of tax-deferral strategies, including tax deferred exchanges, when evaluating its future tax position. The Company has a full valuation allowance against the deferred tax asset associated with its charitable contributions. The Company has a valuation allowance against its general business credits, other than those general business credits which are eligible to be utilized to reduce future AMT liabilities. The Company has a valuation allowance against certain of its state net operating losses and state bonus depreciation deferred assets. These valuation allowances exist because management believes it is more likely than not that the Company will not realize these benefits.

The Company applies the “with-and-without” methodology for recognizing excess tax benefits from the deduction of stock-based compensation. The net operating loss available for the tax return, as is noted in the paragraph above, is greater than the net operating loss available for the tax provision due to excess deductions from stock-based compensation reported on the return, as well as the impact of adjustments to the net operating loss under accounting guidance on accounting for uncertainty in income taxes. As of January 31, 2013, the Company has not recorded a net deferred tax asset of approximately $17,299,000 from excess stock-based compensation deductions taken on the tax return for which a benefit has not yet been recognized in the Company’s tax provision.