Inventory Impairments and Land Option Contract Abandonments (Narratives) (Details)	3 Months Ended		9 Months Ended
	Aug. 31, 2025 USD ($) community	Aug. 31, 2024 USD ($)	Aug. 31, 2025 USD ($) community	Aug. 31, 2024 USD ($)	Nov. 30, 2024 USD ($) community
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Number of land parcels or communities evaluated for recoverability | community	14		14		8
Carrying value of communities of land parcels evaluated for impairment	$ 168,700,000		$ 168,700,000		$ 139,500,000
Inventory impairment charges	$ 7,300,000	$ 0	$ 7,300,000	$ 0
Number of communities with recognized Inventory impairment charges | community	1		1
Aggregate carrying value of inventory impacted by pretax, noncash inventory impairment charges	$ 26,700,000		$ 26,700,000		$ 32,100,000
Number of communities and various other land parcels impacted by pretax, noncash inventory impairment charges | community	6		6		4
Land Option Contract Abandonment
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Land option abandonments	$ 4,000,000.0	$ 1,200,000	$ 11,000,000.0	$ 3,700,000