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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, 2026 | Feb. 28, 2025 | Feb. 29, 2024
Summary of significant accounting policies |  |  |
General and administrative expenses charged to inventory | $ 28.6 | $ 23.6 | $ 23.4
General and administrative expenses directly attributable to the procurement of inventory included in inventory balances | $ 10.6 | $ 9.7 |
Cost of goods sold manufactured by vendors | Supplier concentration risk | Vendors in Far East |  |  |
Summary of significant accounting policies |  |  |
Concentration risk percentage | 83.00% | 79.00% | 79.00%
Cost of goods sold manufactured by vendors | Supplier concentration risk | Vendors Located in China |  |  |
Summary of significant accounting policies |  |  |
Concentration risk percentage | 57.00% | 63.00% | 62.00%
Cost of goods sold manufactured by vendors | Supplier concentration risk | Vendor located in Mexico |  |  |
Summary of significant accounting policies |  |  |
Concentration risk percentage |  | 14.00% | 12.00%
Cost of goods sold manufactured by vendors | Supplier concentration risk | Top two manufacturers |  |  |
Summary of significant accounting policies |  |  |
Concentration risk percentage | 15.00% | 21.00% | 19.00%
Cost of goods sold manufactured by vendors | Supplier concentration risk | Top five suppliers |  |  |
Summary of significant accounting policies |  |  |
Concentration risk percentage | 27.00% | 36.00% | 33.00%

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