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Revenues and Contract Balances - Disaggregation of Revenues (Details) - USD ($)
$ in Thousands
 3 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Disaggregation Of Revenue [Line Items]    
Revenues $ 2,287,623 $ 2,056,889
Expertise    
Disaggregation Of Revenue [Line Items]    
Revenues 986,891 988,265
Technology    
Disaggregation Of Revenue [Line Items]    
Revenues 1,300,732 1,068,624
Prime contractor    
Disaggregation Of Revenue [Line Items]    
Revenues 2,076,899 1,880,419
Subcontractor    
Disaggregation Of Revenue [Line Items]    
Revenues 210,724 176,470
Department of Defense    
Disaggregation Of Revenue [Line Items]    
Revenues 1,179,626 1,087,288
Intelligence Community    
Disaggregation Of Revenue [Line Items]    
Revenues 596,429 534,343
Federal civilian agencies    
Disaggregation Of Revenue [Line Items]    
Revenues 411,730 352,219
Commercial and other    
Disaggregation Of Revenue [Line Items]    
Revenues 99,838 83,039
Cost-plus-fee    
Disaggregation Of Revenue [Line Items]    
Revenues 1,382,630 1,280,010
Fixed-price    
Disaggregation Of Revenue [Line Items]    
Revenues 611,493 475,256
Time-and-materials    
Disaggregation Of Revenue [Line Items]    
Revenues 293,500 301,623
Domestic    
Disaggregation Of Revenue [Line Items]    
Revenues 2,210,044 1,996,321
Domestic | Expertise    
Disaggregation Of Revenue [Line Items]    
Revenues 936,344 956,496
Domestic | Technology    
Disaggregation Of Revenue [Line Items]    
Revenues 1,273,700 1,039,825
Domestic | Prime contractor    
Disaggregation Of Revenue [Line Items]    
Revenues 2,006,508 1,826,763
Domestic | Subcontractor    
Disaggregation Of Revenue [Line Items]    
Revenues 203,536 169,558
Domestic | Department of Defense    
Disaggregation Of Revenue [Line Items]    
Revenues 1,179,626 1,087,288
Domestic | Intelligence Community    
Disaggregation Of Revenue [Line Items]    
Revenues 596,429 534,343
Domestic | Federal civilian agencies    
Disaggregation Of Revenue [Line Items]    
Revenues 411,730 352,219
Domestic | Commercial and other    
Disaggregation Of Revenue [Line Items]    
Revenues 22,259 22,471
Domestic | Cost-plus-fee    
Disaggregation Of Revenue [Line Items]    
Revenues 1,382,630 1,280,010
Domestic | Fixed-price    
Disaggregation Of Revenue [Line Items]    
Revenues 564,825 439,240
Domestic | Time-and-materials    
Disaggregation Of Revenue [Line Items]    
Revenues 262,589 277,071
International    
Disaggregation Of Revenue [Line Items]    
Revenues 77,579 60,568
International | Expertise    
Disaggregation Of Revenue [Line Items]    
Revenues 50,547 31,769
International | Technology    
Disaggregation Of Revenue [Line Items]    
Revenues 27,032 28,799
International | Prime contractor    
Disaggregation Of Revenue [Line Items]    
Revenues 70,391 53,656
International | Subcontractor    
Disaggregation Of Revenue [Line Items]    
Revenues 7,188 6,912
International | Department of Defense    
Disaggregation Of Revenue [Line Items]    
Revenues 0 0
International | Intelligence Community    
Disaggregation Of Revenue [Line Items]    
Revenues 0 0
International | Federal civilian agencies    
Disaggregation Of Revenue [Line Items]    
Revenues 0 0
International | Commercial and other    
Disaggregation Of Revenue [Line Items]    
Revenues 77,579 60,568
International | Cost-plus-fee    
Disaggregation Of Revenue [Line Items]    
Revenues 0 0
International | Fixed-price    
Disaggregation Of Revenue [Line Items]    
Revenues 46,668 36,016
International | Time-and-materials    
Disaggregation Of Revenue [Line Items]    
Revenues $ 30,911 $ 24,552