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Income Taxes - Narrative (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2023
Dec. 31, 2022
Sep. 30, 2023
Mar. 31, 2023
Operating Loss Carryforwards [Line Items]            
Effective income tax rate (as a percent) 29.80% 25.60% 24.70% 23.30%    
Income tax reserves $ 106,801   $ 106,801   $ 769,800 $ 552,623
Deferred tax assets decrease 656,200          
Decrease in accrued interest on uncertain tax positions 5,300          
Unrecognized tax benefits, prior period 31,700          
Minimum            
Operating Loss Carryforwards [Line Items]            
Potential future tax expense that would arise 40,400   40,400      
Maximum            
Operating Loss Carryforwards [Line Items]            
Potential future tax expense that would arise 64,900   64,900      
Tax Years 2013-2015            
Operating Loss Carryforwards [Line Items]            
Income tax assessments     $ 11,800      
Tax Year 2023            
Operating Loss Carryforwards [Line Items]            
Unrecognized tax benefits, prior period 22,000          
Six Months Ended September 30, 2023            
Operating Loss Carryforwards [Line Items]            
Unrecognized tax benefits, prior period $ 9,700