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Commitments and Contingencies (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Feb. 29, 2012
Feb. 28, 2011
Changes in the Company's warranty liability    
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