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Income Taxes (Details) (USD $) | 3 Months Ended | 9 Months Ended |  | 3 Months Ended
--- | --- | --- | --- | ---
Aug. 31, 2012 | Aug. 31, 2011 | Aug. 31, 2012 | Aug. 31, 2011 | Nov. 30, 2011 | May 31, 2012 State and Local Jurisdiction
Income Tax Contingency [Line Items] |  |  |  |  |  |
Income tax benefit (expense) | $ 10,700,000 | $ 0 | $ 14,800,000 | $ (100,000) |  |
Income tax benefit from resolution of federal tax audit | 10,800,000 |  |  |  |  |
Deferred tax asset from resolution of federal tax audit | 1,100,000 |  |  |  |  |
Receivable from resolution of federal tax audit | 10,100,000 |  | 10,100,000 |  |  |
Income tax refund amount | 1,800,000 |  | 6,217,000 | 182,000 |  | 4,100,000
Valuation allowance recorded against the net deferred tax assets generated from loss for period | 7,100,000 | 2,500,000 | 35,100,000 | 73,300,000 |  |
Net deferred tax assets | 0 |  | 0 |  | 1,100,000 |
Valuation allowance | 882,900,000 |  | 882,900,000 |  | 847,800,000 |
Net Increase (reduction) in valuation allowance |  |  | 35,100,000 |  |  |
Additions (reductions) in total gross unrecognized tax benefits | 0 |  | 400,000 |  |  |
Total amount of unrecognized tax benefits, including interest and penalties | 1,400,000 |  | 1,400,000 |  |  |
Anticipated decrease in unrecognized tax benefit during 12 months following current reporting date | $ 200,000 |  | $ 200,000 |  |  |

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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FASB -Name Statement of Financial Accounting Standard (FAS) -Number 109 -Paragraph 43 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 amount of cash received during the period as refunds for the overpayment of taxes. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 29 -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 230 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4297-108586 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3536-108585 + Details
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