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Goodwill and Intangible Assets - Amortization (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Nov. 30, 2015
Nov. 30, 2014
Nov. 30, 2015
Nov. 30, 2014
Goodwill and Intangible Assets        
Aggregate Amortization Expense $ 6,861 $ 6,853 $ 20,883 $ 18,427
Estimated Amortization Expense        
February 2016 27,734   27,734  
February 2017 26,511   26,511  
February 2018 23,166   23,166  
February 2019 18,555   18,555  
February 2020 17,138   17,138  
February 2021 $ 14,727   $ 14,727