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Shareholders' Equity (Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($)
$ in Thousands
12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2019
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning of the period $ 1,489,268 $ 1,176,339 $ 1,050,557
Other comprehensive income (loss) 11,745 (14,962) (12,243)
End of the period balance 2,261,789 1,489,268 1,176,339
Cumulative Translation Adjustment      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning of the period (100,418)    
Other comprehensive income (loss) 10,957    
End of the period balance (89,461) (100,418)  
Defined Benefit Plan      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning of the period (20,016)    
Other comprehensive income (loss) (3,184)    
End of the period balance (23,200) (20,016)  
Deferred Hedging Gains (Losses)      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning of the period (226)    
Other comprehensive income (loss) 3,972    
End of the period balance 3,746 (226)  
Accumulated other comprehensive loss      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning of the period (120,660) (105,698) (93,455)
End of the period balance $ (108,915) $ (120,660) $ (105,698)