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Revenues from Contracts with Customers - Disaggregation of Revenue (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2021
Dec. 31, 2020
Disaggregation Of Revenue [Line Items]        
Revenues $ 1,485,778 $ 1,468,711 $ 2,976,676 $ 2,928,217
Expertise        
Disaggregation Of Revenue [Line Items]        
Revenues 686,309 732,276 1,389,355 1,472,959
Technology        
Disaggregation Of Revenue [Line Items]        
Revenues 799,469 736,435 1,587,321 1,455,258
Prime contractor        
Disaggregation Of Revenue [Line Items]        
Revenues 1,335,846 1,327,025 2,677,405 2,653,863
Subcontractor        
Disaggregation Of Revenue [Line Items]        
Revenues 149,932 141,686 299,271 274,354
Department of Defense        
Disaggregation Of Revenue [Line Items]        
Revenues 1,037,014 1,012,875 2,037,141 2,017,070
Federal civilian agencies        
Disaggregation Of Revenue [Line Items]        
Revenues 371,897 390,034 785,561 780,213
Commercial and other        
Disaggregation Of Revenue [Line Items]        
Revenues 76,867 65,802 153,974 130,934
Cost-plus-fee        
Disaggregation Of Revenue [Line Items]        
Revenues 889,358 843,584 1,783,071 1,667,193
Fixed-price        
Disaggregation Of Revenue [Line Items]        
Revenues 433,290 440,821 840,995 874,635
Time and materials        
Disaggregation Of Revenue [Line Items]        
Revenues 163,130 184,306 352,610 386,389
Domestic        
Disaggregation Of Revenue [Line Items]        
Revenues 1,438,250 1,427,060 2,881,972 2,845,247
Domestic | Expertise        
Disaggregation Of Revenue [Line Items]        
Revenues 668,209 715,812 1,351,833 1,439,009
Domestic | Technology        
Disaggregation Of Revenue [Line Items]        
Revenues 770,041 711,248 1,530,139 1,406,238
Domestic | Prime contractor        
Disaggregation Of Revenue [Line Items]        
Revenues 1,292,529 1,288,533 2,591,182 2,577,238
Domestic | Subcontractor        
Disaggregation Of Revenue [Line Items]        
Revenues 145,721 138,527 290,790 268,009
Domestic | Department of Defense        
Disaggregation Of Revenue [Line Items]        
Revenues 1,037,014 1,012,875 2,037,141 2,017,070
Domestic | Federal civilian agencies        
Disaggregation Of Revenue [Line Items]        
Revenues 371,897 390,034 785,561 780,213
Domestic | Commercial and other        
Disaggregation Of Revenue [Line Items]        
Revenues 29,339 24,151 59,270 47,964
Domestic | Cost-plus-fee        
Disaggregation Of Revenue [Line Items]        
Revenues 889,358 843,584 1,783,071 1,667,193
Domestic | Fixed-price        
Disaggregation Of Revenue [Line Items]        
Revenues 400,011 411,114 774,485 820,698
Domestic | Time and materials        
Disaggregation Of Revenue [Line Items]        
Revenues 148,881 172,362 324,416 357,356
International        
Disaggregation Of Revenue [Line Items]        
Revenues 47,528 41,651 94,704 82,970
International | Expertise        
Disaggregation Of Revenue [Line Items]        
Revenues 18,100 16,464 37,522 33,950
International | Technology        
Disaggregation Of Revenue [Line Items]        
Revenues 29,428 25,187 57,182 49,020
International | Prime contractor        
Disaggregation Of Revenue [Line Items]        
Revenues 43,317 38,492 86,223 76,625
International | Subcontractor        
Disaggregation Of Revenue [Line Items]        
Revenues 4,211 3,159 8,481 6,345
International | Commercial and other        
Disaggregation Of Revenue [Line Items]        
Revenues 47,528 41,651 94,704 82,970
International | Fixed-price        
Disaggregation Of Revenue [Line Items]        
Revenues 33,279 29,707 66,510 53,937
International | Time and materials        
Disaggregation Of Revenue [Line Items]        
Revenues $ 14,249 $ 11,944 $ 28,194 $ 29,033