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Basis of Presentation and Significant Accounting Policies (Narratives) (Details) (USD $)
3 Months Ended
Feb. 28, 2013
Rate
Feb. 29, 2012
Rate
Nov. 30, 2012
Feb. 28, 2013
Convertible senior notes due February 1, 2019 at 1.375%
Jan. 29, 2013
Convertible senior notes due February 1, 2019 at 1.375%
Debt Instrument [Line Items]          
Debt Instrument, Face Amount         $ 230,000,000
Debt Instrument, Interest Rate, Stated Percentage       1.375% 1.375%
Cash equivalents 512,300,000   396,300,000    
Restricted cash 44,619,000   42,362,000    
Comprehensive income (loss) 12,500,000 45,800,000      
Homebuyer Closing Costs Allowances $ 2,100,000 $ 4,400,000      
Homebuyer Closing Costs Allowances Percentage of Housing Revenues 0.50% 1.70%