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Commitments and Contingencies (Tables)
3 Months Ended
Feb. 28, 2013
Commitments and Contingencies Disclosure [Abstract]  
Changes in the Warranty Liability
The changes in our warranty liability are as follows (in thousands):
 
Three Months Ended
 
February 28,
2013
 
February 29,
2012
Balance at beginning of period
$
47,822

 
$
67,693

Warranties issued
2,766

 
1,317

Payments
(8,929
)
 
(4,436
)
Adjustments
1,674

 
33

Balance at end of period
$
43,333

 
$
64,607