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Income Taxes (Details) - USD ($) | 3 Months Ended |
--- | --- | ---
Feb. 28, 2017 | Feb. 29, 2016 | Nov. 30, 2016
Income Tax Expense (Benefit), Continuing Operations [Abstract] |  |  |  |
Income tax expense | [1] | $ (7,200,000) | $ (2,900,000) |
Effective Income Tax Rate Reconciliation, Percent | [1] | 33.60% | 18.10% |
Income Tax Credits and Adjustments |  | $ 1,100,000 | $ 3,300,000 |
Unrecognized Tax Benefits |  |  |  | $ 100,000
Gross Unrecognized Tax Benefits Including Interest and Penalties |  | 100,000 |  | 100,000
Net (increase) reduction in valuation allowance |  | 0 |  |
Valuation allowance |  | 24,800,000 |  | 24,800,000
Income Tax Contingency [Line Items] |  |  |  |
Deferred Tax Assets, Gross |  | 756,700,000 |  | $ 763,800,000
Minimum [Member] |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Amount of Unrecorded Benefit |  | 0 |  |
Maximum [Member] |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Amount of Unrecorded Benefit |  | $ 100,000 |  |
[1] | (a) Amounts reflect the favorable net impact of federal energy tax credits we earned from building energy-efficient homes. The net impact of these tax credits was $1.1 million and $3.3 million for the three months ended February 28, 2017 and February 29, 2016, respectively.

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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32537-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Deferred Tax Asset -URI http://asc.fasb.org/extlink&oid=6510090 + Details
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- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32537-109319 + Details
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