Inventory Impairments and Land Option Contract Abandonments (Narrative) (Details) $ in Millions	12 Months Ended
	Nov. 30, 2021 USD ($) community property	Nov. 30, 2020 USD ($) community property	Nov. 30, 2019 USD ($) property
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Number of land parcels or communities evaluated for recoverability | property	1	11	21
Carrying value of communities of land parcels evaluated for impairment	$ 29.9	$ 123.4	$ 207.7
Impairment of real estate	$ 9.9	$ 22.7	$ 14.0
Number of land parcels or communities associated with non cash inventory impairment charges | property	2	10	8
Aggregate carrying value of inventory impacted by pretax, noncash inventory impairment charges	$ 87.7	$ 113.1
Number of communities and various other land parcels impacted by pretax, noncash inventory impairment charges | community	11	16
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	$ 18.0	$ 46.5	$ 27.1
Land Option Contract Abandonment
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Loss on contract termination	$ 2.1	$ 5.9	$ 3.3