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Treasury Stock - Additional Information (Detail) - USD ($)
 3 Months Ended 6 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Jun. 30, 2025
Mar. 31, 2025
Jun. 30, 2024
Mar. 31, 2024
Class of Stock [Line Items]                
Number of shares of common stock authorized to repurchase 117,000,000   117,000,000          
Treasury Stock, Value $ 853,965,000   $ 853,965,000     $ 831,510,000    
Treasury stock, shares 114,707,570   114,707,570     114,476,691    
Average price per share of common stock $ 89.06   $ 97.11          
Common stock, shares outstanding 51,293,374   51,293,374     51,359,544    
Purchase of treasury stock, shares 143,774   230,879          
Purchase of treasury stock $ (12,838,000) $ (9,589,000) $ (22,455,000) $ (19,115,000)        
Treasury stock, value, acquired, cost method $ 12,838,000 $ 9,589,000 $ 22,455,000 $ 19,115,000        
Treasury stock, shares outstanding 114,707,570   114,707,570          
Common Stock [Member]                
Class of Stock [Line Items]                
Purchase of treasury stock, shares 0 0 0 0        
Purchase of treasury stock $ 0 $ 0 $ 0 $ 0        
Treasury stock, value, acquired, cost method $ 0 $ 0 $ 0 $ 0        
Treasury Stock [Member]                
Class of Stock [Line Items]                
Treasury stock, shares (114,707,570) (114,310,320) (114,707,570) (114,310,320) (114,563,796) (114,476,691) (114,213,951) (114,099,537)
Purchase of treasury stock, shares 143,774 96,369 230,879 210,783        
Purchase of treasury stock $ (12,838,000) $ (9,589,000) $ (22,455,000) $ (19,115,000)        
Treasury stock, value, acquired, cost method 12,838,000 $ 9,589,000 22,455,000 $ 19,115,000        
Minimum [Member] | Treasury Stock [Member]                
Class of Stock [Line Items]                
Purchase of treasury stock     (22,400,000)          
Treasury stock, value, acquired, cost method     22,400,000          
1996 Repurchase Program [Member]                
Class of Stock [Line Items]                
Treasury Stock, Value $ 854,000,000   $ 854,000,000          
Treasury stock, shares 114,707,570   114,707,570          
Common stock equals to percentage of outstanding common stock     69.00%          
Average price per share of common stock     $ 7.44          
Purchase of treasury stock, shares     65,104          
Purchase of treasury stock     $ (4,800,000)          
Treasury stock, value, acquired, cost method     $ 4,800,000          
1996 Repurchase Program [Member] | Common Stock [Member]                
Class of Stock [Line Items]                
Average price per share of common stock     $ 73.71