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Shareholders' Equity (Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Mar. 31, 2015
Accumulated Other Comprehensive Income (Loss)      
Beginning of the period $ 759,948 $ 758,134 $ 804,128
Other comprehensive income (loss) 11,279 1,252 (27,435)
End of the period balance 856,111 759,948 758,134
Cumulative Translation Adjustment      
Accumulated Other Comprehensive Income (Loss)      
Beginning of the period (84,038)    
Other comprehensive income (loss) (5,670)    
End of the period balance (89,708) (84,038)  
Defined Benefit Plan      
Accumulated Other Comprehensive Income (Loss)      
Beginning of the period (26,171)    
Other comprehensive income (loss) 15,691    
End of the period balance (10,480) (26,171)  
Deferred Hedging Gains (Losses)      
Accumulated Other Comprehensive Income (Loss)      
Beginning of the period (1,776)    
Other comprehensive income (loss) 1,258    
End of the period balance (518) (1,776)  
Accumulated other comprehensive loss      
Accumulated Other Comprehensive Income (Loss)      
Beginning of the period (111,985) (113,237) (85,802)
Other comprehensive income (loss) 11,279    
End of the period balance $ (100,706) $ (111,985) $ (113,237)