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Shareholders' Equity (Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($)
$ in Thousands
12 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2016
Accumulated Other Comprehensive Income (Loss)      
Beginning of the period $ 856,111 $ 759,948 $ 758,134
Other comprehensive income (loss) 7,251 11,279 1,252
End of the period balance 1,050,557 856,111 759,948
Cumulative Translation Adjustment      
Accumulated Other Comprehensive Income (Loss)      
Beginning of the period (89,708)    
Other comprehensive income (loss) 5,860    
End of the period balance (83,848) (89,708)  
Defined Benefit Plan      
Accumulated Other Comprehensive Income (Loss)      
Beginning of the period (10,480)    
Other comprehensive income (loss) 4,082    
End of the period balance (6,398) (10,480)  
Deferred Hedging Gains (Losses)      
Accumulated Other Comprehensive Income (Loss)      
Beginning of the period (518)    
Other comprehensive income (loss) (2,691)    
End of the period balance (3,209) (518)  
Accumulated other comprehensive loss      
Accumulated Other Comprehensive Income (Loss)      
Beginning of the period (100,706) (111,985) (113,237)
Other comprehensive income (loss) 7,251    
End of the period balance $ (93,455) $ (100,706) $ (111,985)