| Disaggregation of Revenue | 
 By operating segment and service 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 
 | 
 | 
 | 
 | 
 | 
 
| (dollars in thousands) | 
 | 
Three Months Ended June 30, 2019 | 
 | 
Nine Months Ended June 30, 2019 | 
 
| Program administration | 
 | 
$ | 
212,638  | 
 | 
$ | 
651,343  | 
 
| Assessments and appeals | 
 | 
35,657  | 
 | 
106,209  | 
 
| Workforce and children services | 
 | 
29,146  | 
 | 
76,947  | 
 
| Other | 
 | 
13,691  | 
 | 
41,583  | 
 
| Total U.S. Health and Human Services | 
 | 
291,132  | 
 | 
876,082  | 
 
 | 
 | 
 | 
 | 
 | 
 
| Program administration | 
 | 
204,622  | 
 | 
554,739  | 
 
| Technology solutions | 
 | 
39,994  | 
 | 
116,870  | 
 
| Assessments and appeals | 
 | 
47,679  | 
 | 
127,409  | 
 
| Total U.S. Federal Services | 
 | 
292,295  | 
 | 
799,018  | 
 
 | 
 | 
 | 
 | 
 | 
 
| Workforce and children services | 
 | 
65,819  | 
 | 
208,856  | 
 
| Assessments and appeals | 
 | 
62,152  | 
 | 
192,233  | 
 
| Program administration | 
 | 
16,767  | 
 | 
48,009  | 
 
| Other | 
 | 
2,545  | 
 | 
7,651  | 
 
| Total Outside the U.S. | 
 | 
147,283  | 
 | 
456,749  | 
 
 | 
 | 
 | 
 | 
 | 
 
| Total revenue | 
 | 
$ | 
730,710  | 
 | 
$ | 
2,131,849  | 
 
  
  
By contract type 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 
| (dollars in thousands) | 
 | 
Three Months Ended June 30, 2019 | 
 | 
Nine Months Ended June 30, 2019 | 
 
| Performance-based | 
 | 
$ | 
260,052  | 
 | 
$ | 
834,531  | 
 
| Cost-plus | 
 | 
282,795  | 
 | 
756,227  | 
 
| Fixed price | 
 | 
142,940  | 
 | 
429,962  | 
 
| Time and materials | 
 | 
44,923  | 
 | 
111,129  | 
 
| Total revenue | 
 | 
$ | 
730,710  | 
 | 
$ | 
2,131,849  | 
 
  
By customer type 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 
| (dollars in thousands) | 
 | 
Three Months Ended June 30, 2019 | 
 | 
Nine Months Ended June 30, 2019 | 
 
| New York State government agencies | 
 | 
$ | 
90,295  | 
 | 
$ | 
271,865  | 
 
| Other U.S. state government agencies | 
 | 
204,272  | 
 | 
601,044  | 
 
| Total U.S. state government agencies | 
 | 
294,567  | 
 | 
872,909  | 
 
 | 
 | 
 | 
 | 
 | 
 
| United States Federal Government agencies | 
 | 
276,294  | 
 | 
745,195  | 
 
| International government agencies | 
 | 
136,848  | 
 | 
425,921  | 
 
| Other, including local municipalities and commercial customers | 
 | 
23,001  | 
 | 
87,824  | 
 
| Total revenue | 
 | 
$ | 
730,710  | 
 | 
$ | 
2,131,849  | 
 
  
  
By geography 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 
| (dollars in thousands) | 
 | 
Three Months Ended June 30, 2019 | 
 | 
Nine Months Ended June 30, 2019 | 
 
| United States of America | 
 | 
$ | 
583,428  | 
 | 
$ | 
1,675,101  | 
 
| United Kingdom | 
 | 
72,265  | 
 | 
224,017  | 
 
| Australia | 
 | 
48,744  | 
 | 
153,114  | 
 
| Rest of world | 
 | 
26,273  | 
 | 
79,617  | 
 
| Total revenue | 
 | 
$ | 
730,710  | 
 | 
$ | 
2,131,849  | 
 
  
 |