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Shareholders' Equity (Share Buyback Programs) (Details) - USD ($)
 12 Months Ended 23 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2022
Apr. 30, 2021
May 31, 2020
Class of Stock [Line Items]            
Shares repurchased, amount $ 412,022,000 $ 164,952,000 $ 50,437,000      
Shares authorized for repurchase maximum voting share percent 10.00%          
May 2020            
Class of Stock [Line Items]            
Shares approved (in shares) 17,311,000     17,311,000   17,300,000
Shares approved, amount $ 1,000,000,000     $ 1,000,000,000 $ 1,000,000,000 $ 250,000,000
Shares repurchased (in shares)       6,452,000    
Shares repurchased, amount       $ 576,303,000