Inventory Impairments and Land Option Contract Abandonments (Details) (USD $)	3 Months Ended
	Feb. 28, 2013 community		Feb. 29, 2012 community
Minimum
Unobservable Input
Average selling price	$ 0	[1]	$ 379,200	[1]
Deliveries per month	0	[1]	2	[1]
Discount rate	0.00%	[1]	17.00%	[1]
Maximum
Unobservable Input
Average selling price	$ 0	[1]	$ 498,000	[1]
Deliveries per month	0	[1]	2	[1]
Discount rate	0.00%	[1]	17.00%	[1]

[1] The ranges of inputs used primarily reflect the underlying variability among the various housing markets where each of the impacted communities or land parcels are located, rather than changes in prevailing market conditions.