Financial Services (Details) - USD ($) $ in Thousands		3 Months Ended								12 Months Ended
		Nov. 30, 2018	Aug. 31, 2018	May 31, 2018	Feb. 28, 2018	Nov. 30, 2017	Aug. 31, 2017	May 31, 2017	Feb. 28, 2017	Nov. 30, 2018	Nov. 30, 2017	Nov. 30, 2016	Nov. 30, 2015
Financial services:
Insurance commissions										$ 7,535	$ 6,991	$ 6,728
Title services										5,672	5,268	4,975
Interest income										0	5	0
Total										13,207	12,264	11,703
Expenses
Expenses										(3,844)	(3,430)	(3,817)
Operating income (loss)										345,721	283,403	152,401
Equity in income (loss) of unconsolidated joint ventures										9,367	2,825	(5,601)
Pretax income (loss)		$ 128,936	$ 114,676	$ 78,308	$ 46,045	$ 137,346	$ 79,208	$ 51,982	$ 21,459	367,965	289,995	149,315
Assets
Cash and cash equivalents		575,119				720,861				575,119	720,861	593,000	$ 560,341
Receivables		292,830				244,213				292,830	244,213
Investments in unconsolidated joint ventures		61,960				64,794				61,960	64,794
Other assets		107,383				102,498				107,383	102,498
Total assets		5,073,571				5,041,515				5,073,571	5,041,515
Liabilities
Accounts payable and accrued expenses		924,313				789,393				924,313	789,393
Total liabilities		1,495				966				1,495	966
Financial services [Member]
Expenses
Operating income (loss)										9,363	8,834	7,886
Equity in income (loss) of unconsolidated joint ventures										7,301	4,234	(3,420)
Pretax income (loss)										16,664	13,068	4,466
Assets
Cash and cash equivalents		760				231				760	231	$ 914
Receivables		2,885				1,724				2,885	1,724
Investments in unconsolidated joint ventures	[1]	8,594				10,340				8,594	10,340
Other assets		141				62				141	62
Total assets		12,380				12,357				12,380	12,357
Liabilities
Accounts payable and accrued expenses		$ 1,495				$ 966				$ 1,495	966
KBHS, LLC [Member]
Segment Reporting Information [Line Items]
Partners' Capital Account, Contributions											5,300
Home Community Mortgage LLC [Member]
Liabilities
Partners' Capital Account, Distributions											$ 5,000

[1] In 2017, we made a $5.3 million capital contribution to KBHS and received a $5.0 million distribution from HCM.