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Accumulated Other Comprehensive Income (Loss) (Components of AOCI) (Details) - USD ($)
$ in Thousands
Mar. 31, 2016
Mar. 31, 2015
Mar. 31, 2014
Mar. 31, 2013
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Components of Accumulated Other Comprehensive Loss $ 744,336 $ 627,624 $ 563,360 $ 477,943
Cumulative Translation Adjustment        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Components of Accumulated Other Comprehensive Loss (23,525) (23,412)    
Accumulated Other Comprehensive (Loss) Income        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Components of Accumulated Other Comprehensive Loss $ (23,525) $ (23,412) $ 739 $ (104)