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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
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Feb. 28, 2021 | Feb. 29, 2020 | Feb. 28, 2019
Summary of significant accounting policies |  |  |
General and administrative expenses charged to inventory | $ 33.9 | $ 44.6 | $ 47.7
General and administrative expenses directly attributable to the procurement of inventory included in inventory balances | $ 15.1 | $ 16.0 |
Cost of goods sold manufactured by vendors | Supplier concentration risk | Vendors in Far East |  |  |
Summary of significant accounting policies |  |  |
Concentration risk percentage | 80.00% | 76.00% | 74.00%
Cost of goods sold manufactured by vendors | Supplier concentration risk | Top two manufacturers |  |  |
Summary of significant accounting policies |  |  |
Concentration risk percentage | 20.00% | 18.00% | 20.00%
Cost of goods sold manufactured by vendors | Supplier concentration risk | Top five suppliers |  |  |
Summary of significant accounting policies |  |  |
Concentration risk percentage | 38.00% | 39.00% | 38.00%
Cost of goods sold manufactured by vendors | Supplier concentration risk | Vendor located in Hong Kong |  |  |
Summary of significant accounting policies |  |  |
Concentration risk percentage | 11.00% | 7.00% | 9.00%
Cost of goods sold manufactured by vendors | Supplier concentration risk | Vendor located in Mexico |  |  |
Summary of significant accounting policies |  |  |
Concentration risk percentage | 9.00% | 9.00% | 11.00%

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