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Shareholders' Equity (Share Buyback Programs) (Details) - USD ($)
 11 Months Ended 12 Months Ended 38 Months Ended
Mar. 31, 2018
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2016
Apr. 30, 2017
Mar. 31, 2014
Class of Stock [Line Items]            
Shares repurchased, amount   $ 30,722,000 $ 83,786,000 $ 70,358,000    
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 $ 250,000,000.0      
Shares repurchased (in shares) 843,000          
Shares repurchased, amount $ 30,107,000