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Income Taxes (Details Textual) (USD $) | 3 Months Ended
--- | ---
Feb. 29, 2012 | Feb. 28, 2011
Income Taxes (Textual) [Abstract] |  |
Income tax expense | $ (400,000) | $ (400,000)
Valuation allowance recorded against the net deferred tax assets generated from loss for period | 18,300,000 | 45,100,000
Net deferred tax assets | 1,100,000 | 1,100,000
Valuation allowance | 866,100,000 | 847,800,000
Additions to total gross unrecognized tax benefits | 0 |
Total amount of unrecognized tax benefits, including interest and penalties | 1,900,000 |
Net Increase (reduction) in valuation allowance | 18,300,000 |
Maximum [Member] |  |
Income Tax Contingency [Line Items] |  |
Anticipated Decrease in unrecognized tax benefit during 12 months following current reporting date | 0 |
Minimum [Member] |  |
Income Tax Contingency [Line Items] |  |
Anticipated Decrease in unrecognized tax benefit during 12 months following current reporting date | $ 500,000 |

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- Definition The aggregate tax effects as of the balance sheet date of all future tax deductions arising from temporary differences between tax basis and generally accepted accounting principles basis recognition of assets, liabilities, revenues and expenses, which can only be deducted for tax purposes when permitted under enacted tax laws; net of deducting the allocated valuation allowance, if any, to reduce such amount to net realizable value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 109 -Paragraph 43 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b),(c) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319 + Details
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- Definition The gross amount of increases in unrecognized tax benefits resulting from tax positions that have been or will be taken in the tax return for the current period, excluding amounts pertaining to examined tax returns. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Interpretation (FIN) -Number 48 -Paragraph 21 -Subparagraph a(2) -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. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=6907707&loc=SL6600010-109319 + Details
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