| Disaggregation of Revenue | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 
| Table 4.1: Revenue by Contract Type | 
 | 
 | 
 | 
 
 | 
For the Three Months Ended | 
 
 | 
December 31, 2021 | 
 | 
December 31, 2020 | 
 
 | 
(in thousands) | 
 
| Performance-based | 
$ | 
490,956  | 
 | 
 | 
$ | 
293,960  | 
 | 
 
| Cost-plus | 
340,081  | 
 | 
 | 
384,483  | 
 | 
 
| Fixed price | 
151,505  | 
 | 
 | 
120,777  | 
 | 
 
| Time and materials | 
168,334  | 
 | 
 | 
146,334  | 
 | 
 
| Total revenue | 
$ | 
1,150,876  | 
 | 
 | 
$ | 
945,554  | 
 | 
 
  
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 
| Table 4.2: Revenue by Customer Type |  
 | 
For the Three Months Ended | 
 
 | 
December 31, 2021 | 
 | 
December 31, 2020 | 
 
 | 
(in thousands) | 
 
| U.S. state government agencies | 
$ | 
371,547  | 
 | 
 | 
$ | 
388,114  | 
 | 
 
| United States Federal Government agencies | 
564,094  | 
 | 
 | 
385,573  | 
 | 
 
| International government agencies | 
171,375  | 
 | 
 | 
147,342  | 
 | 
 
| Other, including local municipalities and commercial customers | 
43,860  | 
 | 
 | 
24,525  | 
 | 
 
| Total revenue | 
$ | 
1,150,876  | 
 | 
 | 
$ | 
945,554  | 
 | 
 
  
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 
| Table 4.3: Revenue by Geography |  
 | 
For the Three Months Ended | 
 
 | 
December 31, 2021 | 
 | 
December 31, 2020 | 
 
 | 
(in thousands) | 
 
| United States | 
$ | 
968,288  | 
 | 
 | 
$ | 
790,179  | 
 | 
 
| United Kingdom | 
85,807  | 
 | 
 | 
64,786  | 
 | 
 
| Australia | 
52,814  | 
 | 
 | 
55,932  | 
 | 
 
| Rest of world | 
43,967  | 
 | 
 | 
34,657  | 
 | 
 
| Total revenue | 
$ | 
1,150,876  | 
 | 
 | 
$ | 
945,554  | 
 | 
 
  
 |