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Commitments and Contingencies (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2024
Dec. 31, 2023
Mar. 31, 2024
Concentration Risk [Line Items]          
Operating income (loss) $ 291,259 $ 247,558 $ 1,095,032 $ 748,965  
Net income $ 186,950 $ 145,644 $ 742,295 $ 477,750  
Basic (in dollars per share) $ 1.46 $ 1.11 $ 5.75 $ 3.63  
Diluted (in dollars per share) $ 1.45 $ 1.11 $ 5.73 $ 3.62  
Liability for reductions and/or penalties from U.S Government audits $ 246,703   $ 246,703   $ 363,745
Insurance reimbursements 115,300        
Claimed Indirect Costs | Revision of Prior Period, Adjustment          
Concentration Risk [Line Items]          
Net income $ 90,100   $ 90,100    
Basic (in dollars per share) $ 0.70   $ 0.70    
Diluted (in dollars per share) $ 0.70   $ 0.70    
Claimed Indirect Costs | Increase To Revenue To Reflect Best Estimate Of Final Cost Rates          
Concentration Risk [Line Items]          
Decrease in reserve $ 121,700        
Liability for reductions and/or penalties from U.S Government audits 246,700   $ 246,700   363,700
U.S. Government Contracts          
Concentration Risk [Line Items]          
Liability for reductions and/or penalties from U.S Government audits $ 0   $ 0   0
Contracts with U.S. Government Agencies or Other U.S. Government Contractors | Revenue Benchmark | U.S.          
Concentration Risk [Line Items]          
Concentration risk (as a percent) 98.00% 98.00% 98.00% 98.00%  
Financial Standby Letter of Credit          
Concentration Risk [Line Items]          
Guarantor obligations, carrying value $ 4,500   $ 4,500   4,400
Guarantor obligations, reduction to available borrowings     1,400   1,300
Guarantor obligations, facility 7,500   7,500   7,500
Guarantor obligations, available amount $ 4,500   $ 4,500   $ 4,400