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Commitments and Contingencies (Tables)
3 Months Ended
Feb. 29, 2012
Commitments and Contingencies and Legal Matters [Abstract]  
Changes in the Company warranty liability
                 
    Three Months Ended  
    February 29,
2012
    February 28,
2011
 

Balance at beginning of period

  $ 67,693     $ 93,988  

Warranties issued

    1,317       848  

Payments

    (4,436     (7,809

Adjustments

    33       34  
   

 

 

   

 

 

 

Balance at end of period

  $ 64,607     $ 87,061