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REVENUE RECOGNITION - Disaggregation of Revenue by Contract Type, Customer Information and Prime or Subcontractor (Detail) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2019
Disaggregation Of Revenue [Line Items]                      
Revenue $ 1,564,000 $ 1,551,918 $ 1,468,711 $ 1,459,506 $ 1,495,581 $ 1,465,600 $ 1,395,469 $ 1,363,392 $ 6,044,135 $ 5,720,042 $ 4,986,341
Expertise                      
Disaggregation Of Revenue [Line Items]                      
Revenue                 2,972,966 3,001,512  
Technology                      
Disaggregation Of Revenue [Line Items]                      
Revenue                 3,071,169 2,718,530  
Prime contractor                      
Disaggregation Of Revenue [Line Items]                      
Revenue                 5,449,590 5,211,366  
Subcontractor                      
Disaggregation Of Revenue [Line Items]                      
Revenue                 594,545 508,676  
Department of Defense                      
Disaggregation Of Revenue [Line Items]                      
Revenue                 4,185,292 3,999,261  
Federal civilian agencies                      
Disaggregation Of Revenue [Line Items]                      
Revenue                 1,585,672 1,467,801  
Commercial and other                      
Disaggregation Of Revenue [Line Items]                      
Revenue                 273,171 252,980  
Cost-plus-fee                      
Disaggregation Of Revenue [Line Items]                      
Revenue                 3,504,838 3,274,707  
Firm fixed-price                      
Disaggregation Of Revenue [Line Items]                      
Revenue                 1,769,841 1,629,475  
Time and materials                      
Disaggregation Of Revenue [Line Items]                      
Revenue                 769,456 815,860  
Domestic                      
Disaggregation Of Revenue [Line Items]                      
Revenue                 5,868,392 5,556,672 4,829,450
Domestic | Expertise                      
Disaggregation Of Revenue [Line Items]                      
Revenue                 2,901,204 2,938,379  
Domestic | Technology                      
Disaggregation Of Revenue [Line Items]                      
Revenue                 2,967,188 2,618,293  
Domestic | Prime contractor                      
Disaggregation Of Revenue [Line Items]                      
Revenue                 5,284,761 5,057,930  
Domestic | Subcontractor                      
Disaggregation Of Revenue [Line Items]                      
Revenue                 583,631 498,742  
Domestic | Department of Defense                      
Disaggregation Of Revenue [Line Items]                      
Revenue                 4,185,292 3,999,261  
Domestic | Federal civilian agencies                      
Disaggregation Of Revenue [Line Items]                      
Revenue                 1,585,672 1,467,801  
Domestic | Commercial and other                      
Disaggregation Of Revenue [Line Items]                      
Revenue                 97,428 89,610  
Domestic | Cost-plus-fee                      
Disaggregation Of Revenue [Line Items]                      
Revenue                 3,504,838 3,274,707  
Domestic | Firm fixed-price                      
Disaggregation Of Revenue [Line Items]                      
Revenue                 1,651,343 1,524,381  
Domestic | Time and materials                      
Disaggregation Of Revenue [Line Items]                      
Revenue                 712,211 757,584  
International                      
Disaggregation Of Revenue [Line Items]                      
Revenue                 175,743 163,370 $ 156,891
International | Expertise                      
Disaggregation Of Revenue [Line Items]                      
Revenue                 71,762 63,133  
International | Technology                      
Disaggregation Of Revenue [Line Items]                      
Revenue                 103,981 100,237  
International | Prime contractor                      
Disaggregation Of Revenue [Line Items]                      
Revenue                 164,829 153,436  
International | Subcontractor                      
Disaggregation Of Revenue [Line Items]                      
Revenue                 10,914 9,934  
International | Commercial and other                      
Disaggregation Of Revenue [Line Items]                      
Revenue                 175,743 163,370  
International | Firm fixed-price                      
Disaggregation Of Revenue [Line Items]                      
Revenue                 118,498 105,094  
International | Time and materials                      
Disaggregation Of Revenue [Line Items]                      
Revenue                 $ 57,245 $ 58,276