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Commitments and Contingencies (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Mar. 31, 2024
Concentration Risk [Line Items]          
Operating income (loss) $ 548,609 $ 266,989 $ 803,773 $ 501,407  
Net income $ 390,112 $ 170,718 $ 555,345 $ 332,106  
Basic (in dollars per share) $ 3.02 $ 1.29 $ 4.29 $ 2.52  
Diluted (in dollars per share) $ 3.01 $ 1.29 $ 4.27 $ 2.51  
Liability for reductions and/or penalties from U.S Government audits $ 245,925   $ 245,925   $ 363,745
Insurance reimbursements 115,300        
Claimed Indirect Costs | Revision of Prior Period, Adjustment          
Concentration Risk [Line Items]          
Operating income (loss) 121,700   121,700    
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 245,900   $ 245,900   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) 99.00% 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