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Shareholders' Equity - Components of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Accumulated Other Comprehensive Income (Loss)        
Beginning of the period     $ 856,111 $ 759,948
Other comprehensive income (loss) $ 3,225 $ 1,718 1,903 3,870
End of the period 921,835 716,034 921,835 716,034
Cumulative Translation Adjustment        
Accumulated Other Comprehensive Income (Loss)        
Beginning of the period     (89,708)  
Other comprehensive income (loss)     3,641  
End of the period (86,067)   (86,067)  
Defined Benefit Plan        
Accumulated Other Comprehensive Income (Loss)        
Beginning of the period     (10,480)  
Other comprehensive income (loss)     482  
End of the period (9,998)   (9,998)  
Deferred Hedging Losses        
Accumulated Other Comprehensive Income (Loss)        
Beginning of the period     (518)  
Other comprehensive income (loss)     (2,220)  
End of the period (2,738)   (2,738)  
Total        
Accumulated Other Comprehensive Income (Loss)        
Beginning of the period     (100,706) (111,985)
Other comprehensive income (loss)     1,903  
End of the period $ (98,803) $ (108,115) $ (98,803) $ (108,115)