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Commitments and Contingencies (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Jul. 21, 2023
Sep. 30, 2023
Jun. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Mar. 31, 2023
Concentration Risk [Line Items]              
Operating income (loss)   $ 266,989   $ 223,921 $ 501,407 $ 431,116  
Net income   $ 170,718   $ 170,932 $ 332,106 $ 309,216  
Basic (in dollars per share)   $ 1.29   $ 1.28 $ 2.52 $ 2.32  
Diluted (in dollars per share)   $ 1.29   $ 1.28 $ 2.51 $ 2.31  
Claimed Indirect Costs              
Concentration Risk [Line Items]              
Loss contingency accrual, period increase (decrease)   $ 18,300          
Claimed Indirect Costs | Revision of Prior Period, Adjustment              
Concentration Risk [Line Items]              
Operating income (loss)   18,300     $ 18,300    
Net income   $ 13,500     $ 13,500    
Basic (in dollars per share)   $ 0.10     $ 0.10    
Diluted (in dollars per share)   $ 0.10     $ 0.10    
U.S. Department of Justice              
Concentration Risk [Line Items]              
Estimate of possible loss     $ 377,500       $ 350,000
U.S. Department of Justice | Minimum              
Concentration Risk [Line Items]              
Estimate of possible loss     350,000        
U.S. Department of Justice | Maximum              
Concentration Risk [Line Items]              
Estimate of possible loss     378,000        
Unfavorable Regulatory Action | Claimed Indirect Costs              
Concentration Risk [Line Items]              
Liability for reductions and/or penalties from U.S Government audits   $ 328,900     $ 328,900   326,700
Unfavorable Regulatory Action | U.S. Department of Justice              
Concentration Risk [Line Items]              
Amount awarded to other party $ 377,500            
Contracts with U.S. Government Agencies or Other U.S. Government Contractors | Revenue Benchmark | Total U.S. government              
Concentration Risk [Line Items]              
Concentration risk (as a percent)   99.00%   97.00% 98.00% 97.00%  
Financial Standby Letter of Credit              
Concentration Risk [Line Items]              
Guarantor obligations, carrying value   $ 4,400     $ 4,400   6,100
Guarantor obligations, reduction to available borrowings     $ 1,300   1,300    
Guarantor obligations, facility   7,500     7,500   7,500
Guarantor obligations, available amount   $ 4,400     $ 4,400   $ 2,700