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Shareholders' Equity (Share Buyback Programs) (Details) - USD ($)
 12 Months Ended 25 Months Ended 38 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2019
Apr. 30, 2017
Mar. 31, 2014
Class of Stock [Line Items]            
Shares repurchased, amount $ 32,449,000 $ 30,722,000 $ 83,786,000      
Shares authorized for repurchase maximum voting share percent 10.00%          
March 2014 program            
Class of Stock [Line Items]            
Shares approved (in shares) 17,311,000     17,311,000    
Shares approved, amount $ 250,000,000     $ 250,000,000   $ 250,000,000.0
Shares repurchased (in shares)         9,113,000  
Shares repurchased, amount         $ 155,983,000  
March 2017 program            
Class of Stock [Line Items]            
Shares approved (in shares) 17,311,000     17,311,000    
Shares approved, amount $ 250,000,000   $ 250,000,000.0 $ 250,000,000    
Shares repurchased (in shares)       1,651,000    
Shares repurchased, amount       $ 62,567,000