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Commitments and Contingencies (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2023
Mar. 31, 2023
Jun. 30, 2024
Sep. 30, 2023
Jun. 30, 2023
Mar. 31, 2024
Concentration Risk [Line Items]            
Operating income (loss)     $ 255,164   $ 234,418  
Net income     $ 165,233   $ 161,388  
Basic (in dollars per share)     $ 1.27   $ 1.22  
Diluted (in dollars per share)     $ 1.27   $ 1.22  
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
Claimed Indirect Costs | Unfavorable Regulatory Action            
Concentration Risk [Line Items]            
Liability for reductions and/or penalties from U.S Government audits     $ 374,800     $ 363,700
U.S. Government Contracts            
Concentration Risk [Line Items]            
Liability for reductions and/or penalties from U.S Government audits     $ 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%  
Financial Standby Letter of Credit            
Concentration Risk [Line Items]            
Guarantor obligations, carrying value     $ 4,800     4,400
Guarantor obligations, reduction to available borrowings $ 1,700 $ 1,300        
Guarantor obligations, facility     7,500     7,500
Guarantor obligations, available amount     $ 4,400     $ 4,400