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Commitments and Contingencies (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Aug. 31, 2013
Aug. 31, 2012
Aug. 31, 2013
Aug. 31, 2012
Accrual for warranty returns        
Beginning balance $ 20,782 $ 23,313 $ 23,150 $ 26,665
Additions to the accrual 9,578 7,899 18,776 14,773
Reductions of the accrual - payments and credits issued (9,003) (9,352) (20,569) (19,578)
Ending balance $ 21,357 $ 21,860 $ 21,357 $ 21,860
Minimum
       
Warranties        
Product warranty period     2 years  
Maximum
       
Warranties        
Product warranty period     5 years