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Consolidated Statements of Comprehensive Income (Loss) - USD ($)
$ in Thousands
 12 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2023
Comprehensive income (loss) (pretax):      
Pretax earnings $ 477,512 $ 840,177 $ 1,219,397
Comprehensive income (loss) (tax effect):      
Income tax expense 110,422 211,470 294,925
Comprehensive income (loss) (net of tax):      
Earnings available to common stockholders 367,090 628,707 924,472
Other comprehensive income (loss):      
Foreign currency translation (pretax) 3,833 2,832 782
Foreign currency translation (tax effect) 0    
Foreign currency translation (net of tax) 3,833 2,832 782
Unrealized gain (loss) on investments (pretax) 3,709 70,703 367,533
Unrealized gain (loss) on investments (tax effect) (1,146) (14,846) (78,056)
Unrealized gain (loss) on investments (net of tax) 2,563 55,857 289,477
Change in fair value cash flow hedges (pretax) 4,990 8,497 6,672
Change in fair value of cash flow hedges (tax effect) (1,285) (2,087) (1,639)
Change in fair value of cash flow hedges, (net of tax) 3,705 6,410 5,033
Postretirement benefit obligation gain (loss) (pretax) 2,065 1,849 2,772
Postretirement benefit obligation gain (loss) (tax effect) (507) (454) (681)
Postretirement benefit obligation gain (loss) (net of tax) 1,558 1,395 2,091
Amounts reclassified into earnings on hedging activities, pre-tax (13,455) (5,417) (772)
Amounts reclassified into earnings on hedging activities, tax 3,364 1,330 190
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, after Tax, Total 10,091 4,087 582
Other Comprehensive Income (Loss), before Tax, Total 6,524 78,464 359,643
Other Comprehensive Income (Loss), Tax, Total 426 16,057 75,926
Total other comprehensive income (loss) (net of tax) 6,098 62,407 283,717
Other Comprehensive Income (Loss), before Tax, Portion Attributable to Parent, Total 470,988 918,641 859,754
Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent, Total 109,996 227,527 218,999
Total comprehensive income (loss) (net of tax) $ 360,992 $ 691,114 $ 640,755