Segment Information (Narratives) (Details)	9 Months Ended
	Aug. 31, 2025 segment
Schedule of Equity Method Investments [Line Items]
Number of reportable segments	5
KBHS, LLC | Financial services
Schedule of Equity Method Investments [Line Items]
Ownership interest in joint venture	50.00%
KBHS, LLC | GR Alliance, LLC
Schedule of Equity Method Investments [Line Items]
Ownership interest in joint venture	50.00%
Homebuilding
Schedule of Equity Method Investments [Line Items]
Number of reportable segments	4
Financial services
Schedule of Equity Method Investments [Line Items]
Number of reportable segments	1