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Inventory Impairments and Land Option Contract Abandonments - Narrative (Details) $ in Millions | 12 Months Ended
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Nov. 30, 2020 USD ($) community property | Nov. 30, 2019 USD ($) property community | Nov. 30, 2018 USD ($) property
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31) |  |  |
Number of land parcels or communities evaluated for recoverability | property | 24 | 40 | 57
Carrying value of communities of land parcels evaluated for impairment | $ 228.1 | $ 326.3 | $ 356.1
Impairment of real estate | $ 22.7 | $ 14.0 | $ 26.1
Number of land parcels or communities associated with non cash inventory impairment charges | property | 10 | 8 | 13
Aggregate carrying value of inventory impacted by pretax, noncash inventory impairment charges | $ 113.1 | $ 115.6 |
Number of communities and various other land parcels impacted by pretax, noncash inventory impairment charges | community | 16 | 19 |
Expected realization period of inventory maximum | 5 years |  |
Minimum |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31) |  |  |
Expected realization period of inventory maximum | 1 year |  |
Maximum |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31) |  |  |
Expected realization period of inventory maximum | 10 years |  |
Estimate of Fair Value Measurement |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31) |  |  |
Fair Value | $ 46.5 | $ 27.1 | $ 44.1
Land Option Contract Abandonment |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31) |  |  |
Loss on contract termination | $ 5.9 | $ 3.3 | $ 2.9

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