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Commitments and Contingencies (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Aug. 31, 2012
Aug. 31, 2011
Aug. 31, 2012
Y
Aug. 31, 2011
Warranties        
Product warranty period, low end of range (in years)     2  
Product warranty period, high end of range (in years)     5  
Accrual for warranty returns        
Beginning balance $ 23,313 $ 24,369 $ 26,665 $ 24,021
Additions to accrual 7,899 9,386 14,773 16,496
Reductions of the accrual - payments and credits issued (9,352) (9,303) (19,578) (16,065)
Ending balance $ 21,860 $ 24,452 $ 21,860 $ 24,452