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Consolidated Statements of Changes in Stockholders' Equity - USD ($)
$ in Thousands
Total
Common Stock [Member]
Additional Paid-in Capital [Member]
Accumulated Other Comprehensive Income (Loss) [Member]
Retained Earnings [Member]
Less: Treasury Common Stock [Member]
Less: Treasury Preferred Stock [Member]
Nonvoting Common Stock [Member]
Common Stock [Member]
Balance at Mar. 31, 2022 $ 5,897,161 $ 10,497 $ 453,819 $ 1,906 $ 6,112,401 $ 525,653 $ 151,997  
Consolidated statement of change in equity                
Common stock dividend     (176)         $ (176)
Foreign currency translation 782     782        
Unrealized net gain (loss) on investments, net of tax 289,477     289,477        
Change in fair value of cash flow hedges, net of tax 5,033     5,033        
Amounts reclassified into earnings on hedging activities, net (582)     (582)        
Change in post retirement benefit obligations 2,091     2,091        
Net Income (Loss) 924,472       924,472      
Common stock dividends (19,608)       (19,608)      
Series N Non-Voting Common Stock Dividends (14,117)       (14,117)      
Net activity 607,030   176 283,717 890,747     176
Balance at Mar. 31, 2023 6,504,191 10,497 453,643 285,623 7,003,148 525,653 151,997 176
Consolidated statement of change in equity                
Contribution from related party 8,905   8,905          
Foreign currency translation 2,832     2,832        
Unrealized net gain (loss) on investments, net of tax 55,857     55,857        
Change in fair value of cash flow hedges, net of tax 6,410     6,410        
Amounts reclassified into earnings on hedging activities, net (4,087)     (4,087)        
Change in post retirement benefit obligations 1,395     1,395        
Net Income (Loss) 628,707       628,707      
Series N Non-Voting Common Stock Dividends (31,765)       (31,765)      
Net activity 668,254   8,905 62,407 596,942      
Balance at Mar. 31, 2024 7,172,445 10,497 462,548 223,216 7,600,090 525,653 151,997 176
Consolidated statement of change in equity                
Foreign currency translation 3,833     3,833        
Unrealized net gain (loss) on investments, net of tax 2,563     2,563        
Change in fair value of cash flow hedges, net of tax 3,705     3,705        
Amounts reclassified into earnings on hedging activities, net (10,091)     (10,091)        
Change in post retirement benefit obligations 1,558     1,558        
Net Income (Loss) 367,090       367,090      
Series N Non-Voting Common Stock Dividends (35,294)       (35,294)      
Net activity 325,698     6,098 331,796      
Balance at Mar. 31, 2025 $ 7,498,143 $ 10,497 $ 462,548 $ 229,314 $ 7,931,886 $ 525,653 $ 151,997 $ 176