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Goodwill and Intangible Assets - Amortization (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Aug. 31, 2016
Aug. 31, 2015
Aug. 31, 2016
Aug. 31, 2015
Goodwill and Intangible Assets        
Aggregate Amortization Expense $ 7,222 $ 7,208 $ 14,426 $ 14,022
Estimated Amortization Expense        
February 2017 28,240   28,240  
February 2018 24,931   24,931  
February 2019 20,348   20,348  
February 2020 19,030   19,030  
February 2021 16,471   16,471  
February 2022 $ 5,976   $ 5,976