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Goodwill and Intangible Assets - Amortization (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Nov. 30, 2017
Nov. 30, 2016
Nov. 30, 2017
Nov. 30, 2016
Goodwill and Intangible Assets        
Aggregate Amortization Expense $ 6,430 $ 7,199 $ 19,578 $ 21,625
Estimated Amortization Expense        
Fiscal 2018 26,095   26,095  
Fiscal 2019 20,604   20,604  
Fiscal 2020 19,516   19,516  
Fiscal 2021 16,926   16,926  
Fiscal 2022 6,450   6,450  
Fiscal 2023 $ 4,280   $ 4,280