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Description of Business and Summary of Significant Accounting Policies Sales Incentive Table (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Feb. 28, 2017
Feb. 28, 2019
Feb. 28, 2018
Feb. 29, 2016
Sales Incentives [Abstract]        
Payments and Credits of Sales Incentives $ (35,590) $ (37,516) $ (41,811)  
Reversals for Unearned Sales Incentives (108) (202) (45)  
Marketing Expense 36,413 37,272 42,722  
Accrued Marketing Costs, Current $ 13,154 $ 13,574 $ 14,020 $ 12,439