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Accounting Pronouncements (Transition Adjustment Stockholders' Equity) (Details) - USD ($)
$ in Thousands
Sep. 30, 2023
Mar. 31, 2023
Sep. 30, 2022
Mar. 31, 2022
Liability For Future Policy Benefits [Abstract]        
Deferred acquisition costs and related asset balances $ 121,365 $ 128,463 $ 133,825 $ 133,569
Tax effect (275,664) (285,623)    
Stockholders' Equity Attributable to Parent 7,030,378 6,504,191    
Accumulated Other Comprehensive Income (Loss) [Member]        
Liability For Future Policy Benefits [Abstract]        
Tax effect (275,664) $ (285,623)    
Cumulative Effect Period Of Adoption Adjustment [Member] | Retained Earnings [Member]        
Liability For Future Policy Benefits [Abstract]        
Liability For Future Policy Benefits (4,327)      
Market risk benefits (3,791)      
Deferred acquisition costs and related asset balances 0      
Tax effect 0      
Stockholders' Equity Attributable to Parent (8,118)      
Cumulative Effect Period Of Adoption Adjustment [Member] | Accumulated Other Comprehensive Income (Loss) [Member]        
Liability For Future Policy Benefits [Abstract]        
Liability For Future Policy Benefits (123,132)      
Market risk benefits 0      
Deferred acquisition costs and related asset balances 41,438      
Tax effect 17,156      
Stockholders' Equity Attributable to Parent $ (64,538)