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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. 28, 2021
Feb. 29, 2020
Feb. 28, 2019
Product Liability Contingency [Line Items]      
Customer incentives in SG&A $ 27,100 $ 20,900 $ 17,000
Advertising costs in SG&A 110,700 71,400 62,400
Research and development expenses 30,600 17,800 13,000
Shipping and handling expenses in SG&A $ 1,171,497 972,966 923,045
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 $ 140,100 $ 102,700 $ 89,400