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Inventory Impairments and Land Option Contract Abandonments (Details) | 12 Months Ended
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Nov. 30, 2017 USD ($) property lot community delivery | Nov. 30, 2016 USD ($) property lot community delivery | Nov. 30, 2015 USD ($) property lot delivery
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |  |
Impairment of Real Estate |  | $ 20,605,000 | $ 49,580,000 | $ 8,030,000
Acquisition Costs Related To Land Option Contracts And Other Similar Contracts |  | 26,800,000 | 56,000,000 |
Carrying Value of Communities of Land Parcels Evaluated for Impairment |  | $ 456,900,000 | $ 423,100,000 | $ 286,300,000
Number of land parcels or communities associated with non cash inventory impairment charges | property |  | 10 | 30 | 4
Number of land parcels or communities evaluated for recoverability | property |  | 51 | 68 | 35
Aggregate carrying value of inventory impacted by pretax, noncash inventory impairment charges |  | $ 177,800,000 | $ 215,300,000 |
Number of communities and various other land parcels impacted by pretax, noncash inventory impairment charges | community |  | 24 | 28 |
Number of Lots on which abandonment charges are recognized | lot |  | 710 | 744 | 1,166
Remaining useful life in addition to specified useful lives |  | 1 year |  |
Specified period of remaining useful lives |  | 10 years |  |
Expected realization period of inventory maximum |  | 5 years |  |
Estimate of Fair Value Measurement [Member] |  |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |  |
Assets, Fair Value Disclosure |  | $ 38,400,000 | $ 39,500,000 | $ 12,000,000
Minimum |  |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |  |
Fair Value Estimate Input at Average Selling Price | [1] | $ 207,100 | $ 216,200 | $ 178,100
Fair Value Estimate Input at Sales for Period | delivery | [1] | 1 | 1 | 2
Fair Value Inputs, Discount Rate | [1] | 17.00% | 17.00% | 17.00%
Maximum |  |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |  |
Fair Value Estimate Input at Average Selling Price | [1] | $ 1,576,500 | $ 977,400 | $ 509,400
Fair Value Estimate Input at Sales for Period | delivery | [1] | 4 | 4 | 4
Fair Value Inputs, Discount Rate | [1] | 18.00% | 20.00% | 20.00%
Land Option Contract Abandonment [Member] |  |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |  |
Loss on Contract Termination |  | $ 4,627,000 | $ 3,232,000 | $ 1,561,000
West Coast [Member] |  |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |  |
Impairment of Real Estate |  | $ 13,482,000 | 8,209,000 | 645,000
Number of land parcels or communities associated with non cash inventory impairment charges | property |  | 1 |  |
West Coast [Member] | Land Option Contract Abandonment [Member] |  |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |  |
Loss on Contract Termination |  | $ 3,225,000 | 769,000 | 352,000
Southeast [Member] |  |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |  |
Impairment of Real Estate |  | 3,678,000 | 27,547,000 | 4,132,000
Southeast [Member] | Land Option Contract Abandonment [Member] |  |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |  |
Loss on Contract Termination |  | $ 556,000 | 1,750,000 | $ 984,000
Land Held for Future Development [Member] |  |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |  |
Impairment of Real Estate |  |  | 12,900,000 |
Number of land parcels or communities associated with non cash inventory impairment charges | property |  | 9 |  |
Metro Washington, D.C. [Member] | Southeast [Member] | Land Option Contract Abandonment [Member] |  |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |  |
Loss on Contract Termination |  |  | 1,400,000 |
Metro Washington, D.C. [Member] | Land [Member] |  |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |  |
Impairment of Real Estate |  |  | $ 36,700,000 |
[1] | The ranges of inputs used in each period primarily reflect differences between the housing markets where each impacted community is located, rather than fluctuations in prevailing market conditions.

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