Quarterly report pursuant to Section 13 or 15(d)

Revenue Recognition - Disaggregation of Revenue (Details)

v3.20.1
Revenue Recognition - Disaggregation of Revenue (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2020
Mar. 31, 2019
Disaggregation of Revenue [Line Items]        
Revenue $ 818,135 $ 736,520 $ 1,636,364 $ 1,401,139
United States of America        
Disaggregation of Revenue [Line Items]        
Revenue 702,089 580,473 1,380,941 1,091,673
United Kingdom        
Disaggregation of Revenue [Line Items]        
Revenue 63,722 78,334 136,724 151,752
Australia        
Disaggregation of Revenue [Line Items]        
Revenue 24,540 50,997 61,975 104,370
Rest of world        
Disaggregation of Revenue [Line Items]        
Revenue 27,784 26,716 56,724 53,344
Total U.S. state government agencies        
Disaggregation of Revenue [Line Items]        
Revenue 317,417 287,728 624,526 578,342
New York State government agencies        
Disaggregation of Revenue [Line Items]        
Revenue 100,222 89,858 197,445 181,570
Other U.S. state government agencies        
Disaggregation of Revenue [Line Items]        
Revenue 217,195 197,870 427,081 396,772
United States Federal Government agencies        
Disaggregation of Revenue [Line Items]        
Revenue 374,909 270,623 726,742 468,901
International government agencies        
Disaggregation of Revenue [Line Items]        
Revenue 107,460 146,292 238,276 289,073
Other, including local municipalities and commercial customers        
Disaggregation of Revenue [Line Items]        
Revenue 18,349 31,877 46,820 64,823
Performance-based        
Disaggregation of Revenue [Line Items]        
Revenue 275,669 261,592 568,427 574,479
Cost-plus        
Disaggregation of Revenue [Line Items]        
Revenue 398,973 298,133 761,784 473,431
Fixed price        
Disaggregation of Revenue [Line Items]        
Revenue 100,504 139,871 219,720 287,022
Time and materials        
Disaggregation of Revenue [Line Items]        
Revenue 42,989 36,924 86,433 66,207
U.S. Health & Human Services        
Disaggregation of Revenue [Line Items]        
Revenue 308,698 290,737 620,979 584,950
U.S. Federal Services        
Disaggregation of Revenue [Line Items]        
Revenue 393,391 289,736 759,962 506,723
Outside the U.S.        
Disaggregation of Revenue [Line Items]        
Revenue 116,046 156,047 255,423 309,466
Program administration | U.S. Health & Human Services        
Disaggregation of Revenue [Line Items]        
Revenue 236,436 219,732 473,343 438,705
Program administration | U.S. Federal Services        
Disaggregation of Revenue [Line Items]        
Revenue 304,367 209,996 586,055 350,117
Program administration | Outside the U.S.        
Disaggregation of Revenue [Line Items]        
Revenue 16,945 15,922 34,039 31,242
Technology solutions | U.S. Federal Services        
Disaggregation of Revenue [Line Items]        
Revenue 44,508 37,993 88,114 76,876
Assessments and appeals | U.S. Health & Human Services        
Disaggregation of Revenue [Line Items]        
Revenue 29,916 33,331 63,747 70,552
Assessments and appeals | U.S. Federal Services        
Disaggregation of Revenue [Line Items]        
Revenue 44,516 41,747 85,793 79,730
Assessments and appeals | Outside the U.S.        
Disaggregation of Revenue [Line Items]        
Revenue 62,286 67,771 124,929 130,081
Workforce and children services | U.S. Health & Human Services        
Disaggregation of Revenue [Line Items]        
Revenue 28,734 23,898 58,120 47,801
Workforce and children services | Outside the U.S.        
Disaggregation of Revenue [Line Items]        
Revenue 34,683 69,759 91,922 143,037
Other | U.S. Health & Human Services        
Disaggregation of Revenue [Line Items]        
Revenue 13,612 13,776 25,769 27,892
Other | Outside the U.S.        
Disaggregation of Revenue [Line Items]        
Revenue $ 2,132 $ 2,595 $ 4,533 $ 5,106