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Goodwill and Intangible Assets - Amortization (Details) - USD ($)
$ in Thousands
3 Months Ended
May. 31, 2015
May. 31, 2014
Goodwill and Intangible Assets    
Aggregate Amortization Expense $ 6,814 $ 5,259
Estimated Amortization Expense    
February 2016 27,267  
February 2017 26,886  
February 2018 23,129  
February 2019 18,535  
February 2020 16,995  
February 2021 $ 14,716