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Goodwill and Intangible Assets - Amortization (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Aug. 31, 2017
Aug. 31, 2016
Aug. 31, 2017
Aug. 31, 2016
Goodwill and Intangible Assets        
Aggregate Amortization Expense $ 6,463 $ 7,222 $ 13,148 $ 14,426
Estimated Amortization Expense        
February 2018 25,967   25,967  
February 2019 21,157   21,157  
February 2020 20,056   20,056  
February 2021 17,487   17,487  
February 2022 6,989   6,989  
February 2023 $ 4,830   $ 4,830