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Goodwill and Intangible Assets - Amortization (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Aug. 31, 2015
Aug. 31, 2014
Aug. 31, 2015
Aug. 31, 2014
Goodwill and Intangible Assets        
Aggregate Amortization Expense $ 7,208 $ 6,315 $ 14,022 $ 11,574
Estimated Amortization Expense        
February 2016 27,660   27,660  
February 2017 26,559   26,559  
February 2018 23,105   23,105  
February 2019 18,398   18,398  
February 2020 16,790   16,790  
February 2021 $ 14,767   $ 14,767