Quarterly report pursuant to Section 13 or 15(d)

Revenue Recognition - Disaggregation of Revenue (Details)

v3.21.2
Revenue Recognition - Disaggregation of Revenue (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Disaggregation of Revenue [Line Items]        
Revenue $ 1,243,520 $ 901,337 $ 3,148,354 $ 2,537,701
United States        
Disaggregation of Revenue [Line Items]        
Revenue 1,053,940 787,092 2,622,469 2,168,033
United Kingdom        
Disaggregation of Revenue [Line Items]        
Revenue 74,109 53,364 211,777 190,088
Australia        
Disaggregation of Revenue [Line Items]        
Revenue 65,283 38,415 192,161 100,390
Rest of world        
Disaggregation of Revenue [Line Items]        
Revenue 50,188 22,466 121,947 79,190
Total U.S. state government agencies        
Disaggregation of Revenue [Line Items]        
Revenue 431,987 344,748 1,265,798 969,274
New York State government agencies        
Disaggregation of Revenue [Line Items]        
Revenue 102,195 79,140 289,462 276,585
Other U.S. state government agencies        
Disaggregation of Revenue [Line Items]        
Revenue 329,792 265,608 976,336 692,689
U.S. Federal Government agencies        
Disaggregation of Revenue [Line Items]        
Revenue 594,771 429,031 1,288,213 1,155,773
International government agencies        
Disaggregation of Revenue [Line Items]        
Revenue 180,049 107,353 499,091 345,629
Other, including local municipalities and commercial customers        
Disaggregation of Revenue [Line Items]        
Revenue 36,713 20,205 95,252 67,025
Performance-based        
Disaggregation of Revenue [Line Items]        
Revenue 389,800 295,650 1,033,509 864,077
Cost-plus        
Disaggregation of Revenue [Line Items]        
Revenue 282,808 422,641 953,373 1,184,425
Fixed price        
Disaggregation of Revenue [Line Items]        
Revenue 146,175 132,535 413,296 352,255
Time and materials        
Disaggregation of Revenue [Line Items]        
Revenue 424,737 50,511 748,176 136,944
U.S. Services        
Disaggregation of Revenue [Line Items]        
Revenue 436,338 336,950 1,269,487 957,929
U.S. Federal Services        
Disaggregation of Revenue [Line Items]        
Revenue 617,601 450,143 1,352,982 1,210,105
Outside the U.S.        
Disaggregation of Revenue [Line Items]        
Revenue 189,581 114,244 525,885 369,667
Program administration | U.S. Services        
Disaggregation of Revenue [Line Items]        
Revenue 325,755 251,616 964,981 724,960
Program administration | U.S. Federal Services        
Disaggregation of Revenue [Line Items]        
Revenue 451,594 362,973 1,005,706 949,071
Program administration | Outside the U.S.        
Disaggregation of Revenue [Line Items]        
Revenue 34,296 15,544 80,284 49,583
Technology solutions | U.S. Federal Services        
Disaggregation of Revenue [Line Items]        
Revenue 89,559 42,101 187,006 130,172
Assessments and appeals | U.S. Services        
Disaggregation of Revenue [Line Items]        
Revenue 33,529 40,875 101,561 104,621
Assessments and appeals | U.S. Federal Services        
Disaggregation of Revenue [Line Items]        
Revenue 76,448 45,069 160,270 130,862
Assessments and appeals | Outside the U.S.        
Disaggregation of Revenue [Line Items]        
Revenue 58,664 42,468 169,753 167,397
Workforce and children services | U.S. Services        
Disaggregation of Revenue [Line Items]        
Revenue 64,240 32,531 167,106 90,651
Workforce and children services | Outside the U.S.        
Disaggregation of Revenue [Line Items]        
Revenue 94,310 55,046 269,743 146,968
Other | U.S. Services        
Disaggregation of Revenue [Line Items]        
Revenue 12,814 11,928 35,839 37,697
Other | Outside the U.S.        
Disaggregation of Revenue [Line Items]        
Revenue $ 2,311 $ 1,186 $ 6,105 $ 5,719