Summary of Significant Accounting Policies and Related Information - Inventory and Cost of Goods Sold (Details) - USD ($) $ in Millions	12 Months Ended
Feb. 28, 2023	Feb. 28, 2022	Feb. 28, 2021
Summary of significant accounting policies
General and administrative expenses charged to inventory	$ 22.9	$ 26.0	$ 33.9
General and administrative expenses directly attributable to the procurement of inventory included in inventory balances	$ 11.7	$ 17.6
Cost of goods sold manufactured by vendors \| Supplier concentration risk \| Vendors in Far East
Summary of significant accounting policies
Concentration risk percentage	87.00%	88.00%	80.00%
Cost of goods sold manufactured by vendors \| Supplier concentration risk \| Top two manufacturers
Summary of significant accounting policies
Concentration risk percentage	13.00%	16.00%	20.00%
Cost of goods sold manufactured by vendors \| Supplier concentration risk \| Top five suppliers
Summary of significant accounting policies
Concentration risk percentage	29.00%	36.00%	38.00%
Cost of goods sold manufactured by vendors \| Supplier concentration risk \| Two Vendors Located In China
Summary of significant accounting policies
Concentration risk percentage	6.00%
Cost of goods sold manufactured by vendors \| Supplier concentration risk \| One Vendor Located In China
Summary of significant accounting policies
Concentration risk percentage		9.00%	11.00%
Cost of goods sold manufactured by vendors \| Supplier concentration risk \| Vendor located in Mexico
Summary of significant accounting policies
Concentration risk percentage	7.00%	7.00%	9.00%

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For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
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Aggregate amount of general and administrative costs incurred in each period and charged to inventory.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
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