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Income Taxes (Details) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Aug. 31, 2016 | Aug. 31, 2015 | Aug. 31, 2016 | Aug. 31, 2015 | Nov. 30, 2015
Income Tax Expense (Benefit), Continuing Operations [Abstract] |  |  |  |  |  |
Income tax expense | [1] | $ (14,100,000) | $ (10,700,000) | $ (26,200,000) | $ (16,500,000) |
Effective Income Tax Rate Reconciliation, Percent | [1] | 26.40% | 31.50% | 27.80% | 28.90% |
Income Tax Credits and Adjustments |  | $ 6,700,000 | $ 2,500,000 | $ 10,400,000 | $ 5,600,000 |
Unrecognized Tax Benefits |  | 100,000 |  | 100,000 |  | $ 100,000
Gross Unrecognized Tax Benefits Including Interest and Penalties |  | 100,000 |  | 100,000 |  | 100,000
Net (increase) reduction in valuation allowance |  | 0 |  | 0 |  |
Valuation allowance |  | 37,800,000 |  | 37,800,000 |  | 37,800,000
Income Tax Contingency [Line Items] |  |  |  |  |  |
Deferred Tax Assets, Gross |  | 794,400,000 |  | 794,400,000 |  | $ 820,000,000
Minimum [Member] |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |
Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Amount of Unrecorded Benefit |  | 0 |  | 0 |  |
Maximum [Member] |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |
Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Amount of Unrecorded Benefit |  | $ 100,000 |  | $ 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 $6.7 million and $2.5 million for the three months ended August 31, 2016 and 2015, respectively, and $10.4 million and $5.6 million for the nine months ended August 31, 2016 and 2015, 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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