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Summary of Significant Accounting Policies and Related Information - Revenue Recognition and Costs and Expenses (Details) - USD ($)
$ in Thousands
12 Months Ended
Feb. 29, 2020
Feb. 28, 2019
Feb. 28, 2018
Product Liability Contingency [Line Items]      
Customer incentives in SG&A $ 20,900 $ 17,000 $ 11,800
Advertising costs in SG&A 71,400 62,400 53,700
Research and development expenses 17,800 13,000 13,500
Shipping and handling expenses in SG&A $ 972,966 923,045 867,646
Minimum      
Product Liability Contingency [Line Items]      
Term of allowable sales returns 2 years    
Maximum      
Product Liability Contingency [Line Items]      
Term of allowable sales returns 5 years    
Shipping and Handling      
Product Liability Contingency [Line Items]      
Shipping and handling expenses in SG&A $ 102,700 $ 89,400 $ 78,100