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Inventory Impairments and Land Option Contract Abandonments (Narratives) (Details) | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Aug. 31, 2016 USD ($) lot community delivery | Aug. 31, 2015 USD ($) lot delivery | Aug. 31, 2016 USD ($) property lot delivery | Aug. 31, 2015 USD ($) property lot delivery | Nov. 30, 2015 USD ($) property
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |  |  |
Acquisition Costs Related To Land Option Contracts And Other Similar Contracts | $ 48,200,000 |  | $ 48,200,000 |  | $ 65,600,000
Impairment of Real Estate | 2,579,000 | $ 3,173,000 | $ 13,855,000 | $ 3,173,000 | 8,000,000
Number of land parcels or communities evaluated for recoverability | property |  |  | 43 | 29 |
Carrying Value of Communities or Land Parcels Evaluated for Impairment | 350,000,000 | $ 232,800,000 | $ 350,000,000 | $ 232,800,000 |
Aggregate carrying value of inventory impacted by pretax, noncash inventory impairment charges | $ 224,400,000 |  | $ 224,400,000 |  | $ 254,200,000
Number of communities and various other land parcels impacted by pretax, noncash inventory impairment charges | 24 |  | 24 |  | 28
Land Option Contract Abandonment Lots | lot | 50 | 740 | 542 | 1,166 |
Maximum [Member] |  |  |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |  |  |
Fair Value Estimate Input at Average Selling Price | $ 486,000 | $ 178,100 | $ 486,000 | $ 178,100 |
Fair Value Estimate Input, Delivery For Period | delivery | 3 | 4 | 4 | 4 |
Fair Value Inputs, Discount Rate | 17.00% | 20.00% | 20.00% | 20.00% |
Minimum [Member] |  |  |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |  |  |
Fair Value Estimate Input at Average Selling Price | $ 351,600 | $ 178,100 | $ 280,100 | $ 178,100 |
Fair Value Estimate Input, Delivery For Period | delivery | 2 | 4 | 1 | 4 |
Fair Value Inputs, Discount Rate | 17.00% | 20.00% | 17.00% | 20.00% |
Land Option Contract Abandonment [Member] |  |  |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |  |  |
Payments to Acquire Land | $ (473,000) | $ (359,000) | $ (2,903,000) | $ (1,343,000) |
West Coast [Member] |  |  |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |  |  |
Impairment of Real Estate | $ 2,579,000 | 0 | $ 7,153,000 | 0 |
Number of Land Parcels or Communities Associated with Non Cash Inventory Impairment Charges | 2 |  | 1 |  |
West Coast [Member] | Land Option Contract Abandonment [Member] |  |  |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |  |  |
Payments to Acquire Land | $ (270,000) | (134,000) | $ (691,000) | (134,000) |
Central [Member] |  |  |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |  |  |
Impairment of Real Estate | 0 | 0 | 787,000 | 0 |
Central [Member] | Land Option Contract Abandonment [Member] |  |  |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |  |  |
Payments to Acquire Land | 0 | (225,000) | (460,000) | (225,000) |
Southeast [Member] |  |  |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |  |  |
Impairment of Real Estate | 0 | 3,173,000 | $ 5,915,000 | 3,173,000 |
Number of Land Parcels or Communities Associated with Non Cash Inventory Impairment Charges | property |  |  | 1 |  |
Southeast [Member] | Land Option Contract Abandonment [Member] |  |  |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |  |  |
Payments to Acquire Land | $ (61,000) | $ 0 | $ (1,499,000) | $ (984,000) |
Land Held for Future Development [Member] |  |  |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |  |  |
Impairment of Real Estate |  |  | 5,200,000 |  |
Metro Washington, D.C. [Member] | Southeast [Member] | Land Option Contract Abandonment [Member] |  |  |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |  |  |
Payments to Acquire Land |  |  | (1,438,000) |  |
Metro Washington, D.C. [Member] | Land [Member] | Southeast [Member] |  |  |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |  |  |
Impairment of Real Estate |  |  | $ 5,400,000 |  |
Number of Land Parcels or Communities Associated with Non Cash Inventory Impairment Charges | property |  |  | 2 |  |

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