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Summary of Significant Accounting Policies and Related Information - Warrants (Details) - USD ($)
$ in Thousands
 12 Months Ended
Feb. 28, 2017
Feb. 29, 2016
Feb. 28, 2015
Accrual for warranty returns      
Beginning balance $ 20,622 $ 23,553  
Additions to the accrual 57,686 57,847  
Reductions of the accrual - payments and credits issued (56,542) (60,778)  
Ending balance 21,766 20,622 $ 23,553
SG&A      
Customer incentives in SG&A 18,400 19,400 17,300
Advertising costs in SG&A 111,600 107,500 88,400
Research and development expenses 9,700 10,000 7,400
Shipping and handling expenses in SG&A $ 86,300 $ 88,900 $ 87,900
Minimum      
Warranties      
Product Warranty Period 2 years    
Maximum      
Warranties      
Product Warranty Period 5 years