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Summary of Significant Accounting Policies and Related Information - Inventory and Cost of Goods Sold (Details) - USD ($)
$ in Millions
12 Months Ended
Feb. 28, 2022
Feb. 28, 2021
Feb. 29, 2020
Summary of significant accounting policies      
General and administrative expenses charged to inventory $ 26.0 $ 33.9 $ 44.6
General and administrative expenses directly attributable to the procurement of inventory included in inventory balances $ 17.6 $ 15.1  
Cost of goods sold manufactured by vendors | Supplier concentration risk | Vendors in Far East      
Summary of significant accounting policies      
Concentration risk percentage 88.00% 80.00% 76.00%
Cost of goods sold manufactured by vendors | Supplier concentration risk | Top two manufacturers      
Summary of significant accounting policies      
Concentration risk percentage 16.00% 20.00% 18.00%
Cost of goods sold manufactured by vendors | Supplier concentration risk | Top five suppliers      
Summary of significant accounting policies      
Concentration risk percentage 36.00% 38.00% 39.00%
Cost of goods sold manufactured by vendors | Supplier concentration risk | Vendor located in Hong Kong      
Summary of significant accounting policies      
Concentration risk percentage 9.00% 11.00% 7.00%
Cost of goods sold manufactured by vendors | Supplier concentration risk | Vendor located in Mexico      
Summary of significant accounting policies      
Concentration risk percentage 7.00% 9.00% 9.00%