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Commitments and Contingencies (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Dec. 31, 2023
Jul. 21, 2023
Mar. 31, 2023
Dec. 31, 2023
Sep. 30, 2023
Dec. 31, 2022
Dec. 31, 2023
Dec. 31, 2022
Jun. 30, 2023
Concentration Risk [Line Items]                  
Operating income (loss)       $ 247,558   $ 58,640 $ 748,965 $ 489,756  
Net income       $ 145,644   $ 30,997 $ 477,750 $ 340,213  
Basic (in dollars per share)       $ 1.11   $ 0.23 $ 3.63 $ 2.55  
Diluted (in dollars per share)       $ 1.11   $ 0.23 $ 3.62 $ 2.54  
Claimed Indirect Costs                  
Concentration Risk [Line Items]                  
Decrease in reserve         $ 18,300        
Claimed Indirect Costs | Revision of Prior Period, Adjustment                  
Concentration Risk [Line Items]                  
Operating income (loss)             $ 18,300    
Net income             $ 13,500    
Basic (in dollars per share)             $ 0.10    
Diluted (in dollars per share)             $ 0.10    
U.S. Department of Justice                  
Concentration Risk [Line Items]                  
Estimate of possible loss     $ 350,000           $ 377,500
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 $ 339,900   326,700 $ 339,900     $ 339,900    
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)       98.00%   97.00% 98.00% 97.00%  
Financial Standby Letter of Credit                  
Concentration Risk [Line Items]                  
Guarantor obligations, carrying value 4,500   6,100 $ 4,500     $ 4,500    
Guarantor obligations, reduction to available borrowings 1,400   1,300            
Guarantor obligations, facility 7,500   7,500 7,500     7,500    
Guarantor obligations, available amount $ 4,400   $ 2,700 $ 4,400     $ 4,400