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Summary of Significant Accounting Policies and Related Information - Inventory and Licenses (Details) $ in Millions | 12 Months Ended
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Feb. 28, 2018 USD ($) item | Feb. 28, 2017 USD ($) | Feb. 29, 2016 USD ($)
Summary of significant accounting policies |  |  |
General and administrative expenses charged to inventory | $ | $ 43.2 | $ 41.7 | $ 39.2
General and administrative expenses directly attributable to the procurement of inventory included in inventory balances | $ | $ 11.8 | $ 12.8 |
Number of licensors exceeding 10 percent of net sales revenue | 2 |  |
Supplier concentration risk | Top vendor |  |  |
Summary of significant accounting policies |  |  |
Number of suppliers exceeding 10 percent of product requirements | 1 |  |
Supplier concentration risk | Top two manufacturers |  |  |
Summary of significant accounting policies |  |  |
Number of third-party manufacturers | 2 |  |
Supplier concentration risk | Top five suppliers |  |  |
Summary of significant accounting policies |  |  |
Number of suppliers exceeding 10 percent of product requirements | 5 |  |
Cost of goods sold manufactured by vendors | Supplier concentration risk | Vendors in Far East |  |  |
Summary of significant accounting policies |  |  |
Concentration risk percentage | 74.00% | 71.00% | 70.00%
Cost of goods sold manufactured by vendors | Supplier concentration risk | Top vendor |  |  |
Summary of significant accounting policies |  |  |
Concentration risk percentage | 11.00% |  |
Cost of goods sold manufactured by vendors | Supplier concentration risk | Top two manufacturers |  |  |
Summary of significant accounting policies |  |  |
Concentration risk percentage | 19.00% |  |
Cost of goods sold manufactured by vendors | Supplier concentration risk | Top five suppliers |  |  |
Summary of significant accounting policies |  |  |
Concentration risk percentage | 34.00% |  |
Net sales revenue | Net sales revenue subject to trademark license agreements |  |  |
Summary of significant accounting policies |  |  |
Concentration risk percentage | 45.00% | 44.00% | 45.00%
Net sales revenue | Net sales revenue subject to trademark license agreements | Top Licensor |  |  |
Summary of significant accounting policies |  |  |
Concentration risk percentage | 14.00% |  |
Net sales revenue | Net sales revenue subject to trademark license agreements | Second Top Licensor |  |  |
Summary of significant accounting policies |  |  |
Concentration risk percentage | 13.00% |  |

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