Financial Services (Schedule of Assets and Liabilities) (Details) - USD ($) $ in Thousands		9 Months Ended
		Aug. 31, 2017	Nov. 30, 2016	Aug. 31, 2016	Nov. 30, 2015
Assets
Cash and cash equivalents		$ 494,807	$ 593,000	$ 337,722	$ 560,341
Receivables		229,033	231,665
Investments in unconsolidated joint ventures		64,513	64,016
Other assets		102,394	91,145
Total assets		5,099,559	5,131,624
Liabilities
Accounts payable and accrued expenses		754,703	766,327
Total liabilities		1,535	2,003
Financial services [Member]
Assets
Cash and cash equivalents		754	914	$ 3,053
Receivables		2,224	1,764
Investments in unconsolidated joint ventures	[1]	9,631	7,771
Other assets		78	50
Total assets		12,687	10,499
Liabilities
Accounts payable and accrued expenses		1,535	$ 2,003
KBHS, LLC [Member]
Segment Reporting Information [Line Items]
Limited Partners' Contributed Capital		$ 5,300

[1] Our investments in unconsolidated joint ventures as of August 31, 2017 included a $5.3 million capital contribution we made to KBHS in the 2017 first quarter, and a $5.0 million distribution we received from HCM in the 2017 second quarter.