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Goodwill and Intangible Assets - Amortization (Details) - USD ($)
$ in Thousands
3 Months Ended
May 31, 2017
May 31, 2016
Goodwill and Intangible Assets    
Aggregate Amortization Expense $ 6,685 $ 7,204
Estimated Amortization Expense    
February 2017 25,965  
February 2018 21,025  
February 2019 19,910  
February 2020 17,349  
February 2021 6,841  
February 2022 $ 4,700