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Commitments and Contingencies (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
May 31, 2013
May 31, 2012
Accrual for warranty returns    
Beginning balance $ 25,261 $ 26,665
Additions to accrual 7,087 6,874
Reductions of the accrual - payments and credits issued (11,566) (10,226)
Ending balance $ 20,782 $ 23,313
Minimum
   
Warranties    
Product warranty period 2 years  
Maximum
   
Warranties    
Product warranty period 5 years