Investments in Unconsolidated Joint Ventures (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Feb. 29, 2012	Feb. 28, 2011	Nov. 30, 2011
Statements of operations of unconsolidated joint venture
Revenues		$ 230
Construction and land costs	6	(222)
Other expense, net	(461)	(4,367)
Loss	(455)	(4,359)
Assets
Cash	21,614		8,923
Receivable	14,125		19,503
Inventories	353,522		368,306
Other assets	151		151
Total assets	389,412		396,883
Liabilities and equity
Accounts payable and other liabilities	91,825		96,981
Equity	297,587		299,902
Total liabilities and equity	$ 389,412		$ 396,883