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Goodwill and Intangible Assets - Amortization (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Nov. 30, 2016
Nov. 30, 2015
Nov. 30, 2016
Nov. 30, 2015
Goodwill and Intangible Assets        
Aggregate Amortization Expense $ 7,199 $ 6,861 $ 21,625 $ 20,883
Estimated Amortization Expense        
February 2017 28,289   28,289  
February 2018 24,972   24,972  
February 2019 20,398   20,398  
February 2020 19,083   19,083  
February 2021 16,501   16,501  
February 2022 $ 6,007   $ 6,007