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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, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Accumulated Other Comprehensive Income (Loss)        
Beginning of the period $ 1,198,034 $ 1,055,260 $ 1,176,339 $ 1,050,557
Other comprehensive income (loss) (1,527) (2,224) (3,232) (4,313)
End of the period 1,167,537 1,012,164 1,167,537 1,012,164
Total        
Accumulated Other Comprehensive Income (Loss)        
Beginning of the period (107,403) (95,544) (105,698) (93,455)
End of the period (108,930) $ (97,768) (108,930) $ (97,768)
Cumulative Translation Adjustment        
Accumulated Other Comprehensive Income (Loss)        
Beginning of the period     (92,148)  
Other comprehensive income (loss)     (4,375)  
End of the period (96,523)   (96,523)  
Defined Benefit Plan        
Accumulated Other Comprehensive Income (Loss)        
Beginning of the period     (13,932)  
Other comprehensive income (loss)     64  
End of the period (13,868)   (13,868)  
Deferred Hedging Losses        
Accumulated Other Comprehensive Income (Loss)        
Beginning of the period     382  
Other comprehensive income (loss)     1,079  
End of the period $ 1,461   $ 1,461