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Product Warranty (Tables)
 6 Months Ended
May 31, 2012
Product Warranties Disclosures [Abstract]  
Schedule Of Product Warranty Reserve
The activity in the Company’s warranty reserve was as follows:
 
Three Months Ended
 
Six Months Ended
 
May 31,
 
May 31,
(In thousands)
2012
 
2011
 
2012
 
2011
Warranty reserve, beginning of period
$
85,717

 
103,976

 
88,120

 
109,179

Warranties issued during the period
8,106

 
6,599

 
14,961

 
11,338

Adjustments to pre-existing warranties from changes in estimates
3,680

 
2,689

 
5,047

 
(38
)
Payments
(13,015
)
 
(22,087
)
 
(23,640
)
 
(29,302
)
Warranty reserve, end of period
$
84,488

 
91,177

 
84,488

 
91,177