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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

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