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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, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Accumulated Other Comprehensive Income (Loss)        
Beginning of the period $ 1,567,481 $ 1,198,034 $ 1,489,268 $ 1,176,339
Other comprehensive income (loss) 2,119 (1,527) 1,808 (3,232)
End of the period 1,705,963 1,167,537 1,705,963 1,167,537
Total        
Accumulated Other Comprehensive Income (Loss)        
Beginning of the period (120,971) (107,403) (120,660) (105,698)
End of the period (118,852) $ (108,930) (118,852) $ (108,930)
Cumulative Translation Adjustment        
Accumulated Other Comprehensive Income (Loss)        
Beginning of the period     (100,418)  
Other comprehensive income (loss)     2,706  
End of the period (97,712)   (97,712)  
Defined Benefit Plan        
Accumulated Other Comprehensive Income (Loss)        
Beginning of the period     (20,016)  
Other comprehensive income (loss)     889  
End of the period (19,127)   (19,127)  
Deferred Hedging Losses        
Accumulated Other Comprehensive Income (Loss)        
Beginning of the period     (226)  
Other comprehensive income (loss)     (1,787)  
End of the period $ (2,013)   $ (2,013)