Inventory Impairments and Land Option Contract Abandonments (Narrative) (Details) $ in Millions	12 Months Ended
	Nov. 30, 2022 USD ($) community property	Nov. 30, 2021 USD ($) property community	Nov. 30, 2020 USD ($) property
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Number of land parcels or communities evaluated for recoverability | property	5	1	11
Carrying value of communities of land parcels evaluated for impairment	$ 118.7	$ 29.9	$ 123.4
Impairment of real estate	$ 24.1	$ 9.9	$ 22.7
Number of land parcels or communities associated with non cash inventory impairment charges | property	4	2	10
Aggregate carrying value of inventory impacted by pretax, noncash inventory impairment charges	$ 102.9	$ 87.7
Number of communities and various other land parcels impacted by pretax, noncash inventory impairment charges | community	8	11
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	$ 41.3	$ 18.0	$ 46.5
Land Option Contract Abandonment
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Loss on contract termination	$ 13.2	$ 2.1	$ 5.9