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Commitments and Contingencies (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Nov. 30, 2013
Nov. 30, 2012
Nov. 30, 2013
Nov. 30, 2012
Accrual for warranty returns        
Beginning balance $ 21,357 $ 21,860 $ 23,150 $ 26,665
Additions to the accrual 6,504 11,027 25,280 25,800
Reductions of the accrual - payments and credits issued (5,770) (7,496) (26,339) (27,074)
Ending balance $ 22,091 $ 25,391 $ 22,091 $ 25,391
Minimum
       
Warranties        
Product warranty period     2 years  
Maximum
       
Warranties        
Product warranty period     5 years