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Shareholders' Equity (Share Buyback Programs) (Details) - USD ($)
 12 Months Ended 35 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Mar. 31, 2021
Mar. 31, 2023
Jul. 31, 2022
Apr. 30, 2021
May 31, 2020
Class of Stock [Line Items]              
Shares repurchased $ 418,346,000 $ 412,022,000 $ 164,952,000        
Shares authorized for repurchase maximum voting share (as a percent) 10.00%            
May 2020              
Class of Stock [Line Items]              
Shares approved (in shares) (up to) 17,311,000     17,311,000 17,300,000   17,300,000
Shares approved $ 1,500,000,000     $ 1,500,000,000 $ 1,500,000,000 $ 1,000,000,000 $ 250,000,000
Shares repurchased (in shares)       14,014,000      
Shares repurchased       $ 994,156,000