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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, 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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