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Inventory Impairments and Land Option Contract Abandonments (Narratives) (Details) | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
May 31, 2016 USD ($) property lot delivery | Feb. 29, 2016 USD ($) | May 31, 2015 USD ($) lot delivery | May 31, 2016 USD ($) property lot delivery | May 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 | $ 63,200,000 |  |  | $ 63,200,000 |  | $ 65,600,000
Number of land parcels or communities evaluated for recoverability | property |  |  |  | 32 | 26 |
Carrying Value of Communities or Land Parcels Evaluated for Impairment | 248,700,000 |  | $ 212,500,000 | $ 248,700,000 | $ 212,500,000 |
Impairment of Real Estate | 9,930,000 |  | $ 0 | 11,276,000 | $ 0 | 8,000,000
Aggregate carrying value of inventory impacted by pretax, noncash inventory impairment charges | $ 221,400,000 |  |  | $ 221,400,000 |  | $ 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 | 312 |  | 114 | 492 | 426 |
Maximum [Member] |  |  |  |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |  |  |  |
Fair Value Estimate Input at Average Selling Price | $ 280,100 |  | $ 0 | $ 310,000 | $ 0 |
Fair Value Estimate Input, Delivery For Period | delivery | 4 |  | 0 | 4 | 0 |
Fair Value Inputs, Discount Rate | 20.00% |  | 0.00% | 20.00% | 0.00% |
Minimum [Member] |  |  |  |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |  |  |  |
Fair Value Estimate Input at Average Selling Price | $ 280,100 |  | $ 0 | $ 280,100 | $ 0 |
Fair Value Estimate Input, Delivery For Period | delivery | 4 |  | 0 | 2 | 0 |
Fair Value Inputs, Discount Rate | 17.00% |  | 0.00% | 17.00% | 0.00% |
Land Option Contract Abandonment [Member] |  |  |  |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |  |  |  |
Payments to Acquire Land | $ (1,810,000) |  | $ (536,000) | $ (2,430,000) | $ (984,000) |
West Coast [Member] |  |  |  |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |  |  |  |
Impairment of Real Estate |  |  | 0 |  | 0 |
West Coast [Member] | Land Option Contract Abandonment [Member] |  |  |  |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |  |  |  |
Payments to Acquire Land | (261,000) |  | 0 | (421,000) | 0 |
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 |  | 0 | (460,000) | 0 |
Southeast [Member] |  |  |  |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |  |  |  |
Impairment of Real Estate |  |  | 0 | 5,915,000 | 0 |
Southeast [Member] | Land Option Contract Abandonment [Member] |  |  |  |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |  |  |  |
Payments to Acquire Land |  |  | $ (536,000) | $ (1,438,000) | $ (984,000) |
Land [Member] | West Coast [Member] |  |  |  |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |  |  |  |
Number of Land Parcels or Communities Associated with Non Cash Inventory Impairment Charges | property | 1 |  |  | 1 |  |
Impairment of Real Estate | $ 4,574,000 |  |  | $ 4,574,000 |  |
Land [Member] | Southeast [Member] |  |  |  |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |  |  |  |
Impairment of Real Estate |  | $ 559,000 |  |  |  |
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) |  |  | (1,400,000) |  |
Metro Washington, D.C. [Member] | Land [Member] | Southeast [Member] |  |  |  |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |  |  |  |
Impairment of Real Estate |  |  |  | $ 5,400,000 |  |
Metro Washington, D.C. [Member] | Land [Member] | Southeast [Member] |  |  |  |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |  |  |  |
Number of Land Parcels or Communities Associated with Non Cash Inventory Impairment Charges | property | 2 |  |  | 2 |  |
Impairment of Real Estate | $ 5,356,000 |  |  |  |  |

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