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Financial Instruments and Fair Value Disclosures - (Communities with Indicators for Impairment) (Details)
$ in Thousands
 9 Months Ended
Aug. 31, 2021
USD ($)
community
Aug. 31, 2020
USD ($)
community
Fair Value, Assets and Liabilities Measured on a Recuring and Nonrecurring Basis [Line Items]    
Active communities 1,192 1,194
Number of Communities with potential indicator of impairment 8 28
Number of communities with valuation adjustments 1 14
Valuation adjustments | $ $ 11,849 $ 40,364
Level 3    
Fair Value, Assets and Liabilities Measured on a Recuring and Nonrecurring Basis [Line Items]    
Fair value of communities with valuation adjustments | $ $ 17,117 $ 76,115