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Commitments And Contingent Liabilities (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Nov. 30, 2011
Nov. 30, 2010
Nov. 30, 2009
Commitments And Contingent Liabilities [Abstract]      
Non-refundable option deposits and pre-acquisition costs $ 156.8 $ 157.4  
Rental expense 40.0 40.9 67.9
Termination costs     8.8
Letters of credit outstanding, amount 267.3    
Outstanding performance and surety bonds 628.1    
Uncompleted site improvements amount $ 331.5    
Uncompleted site improvements percentage 53.00%