Segment Information (Narratives) (Details)	3 Months Ended
	Aug. 31, 2018 segment
Schedule of Equity Method Investments [Line Items]
Number of reporting segments	5
KBHS, LLC [Member]
Schedule of Equity Method Investments [Line Items]
Ownership interest in the venture	50.00%
KBHS, LLC [Member] | Stearns Lending, LLC [Member]
Schedule of Equity Method Investments [Line Items]
Ownership interest in the venture	50.00%
Homebuilding [Member]
Schedule of Equity Method Investments [Line Items]
Number of reporting segments	4
Financial services [Member]
Schedule of Equity Method Investments [Line Items]
Number of reporting segments	1