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Summary of Significant Accounting Policies and Related Information - Inventory and Licenses (Details)
$ in Millions
12 Months Ended
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%