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Revenue recognition (Tables) | 12 Months Ended
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Sep. 30, 2020
Revenue from Contract with Customer [Abstract] |
Disaggregation of Revenue | By operating segment and service
|  | Year ended September 30,
(in thousands) |  | 2020 |  | 2019 |  |
Program administration |  | 1,008,591 |  |  | 883,772 |  |  |
Assessments and appeals |  | 141,446 |  |  | 136,109 |  |  |
Workforce and children services |  | 127,595 |  |  | 100,454 |  |  |
Other |  | 51,642 |  |  | 56,153 |  |  |
Total U.S. Services |  | 1,329,274 |  |  | 1,176,488 |  |  |
Program administration |  | 1,288,741 |  |  | 779,573 |  |  |
Technology solutions |  | 169,259 |  |  | 160,342 |  |  |
Assessments and appeals |  | 175,337 |  |  | 171,282 |  |  |
Total U.S. Federal Services |  | 1,633,337 |  |  | 1,111,197 |  |  |
Workforce and children services |  | 206,657 |  |  | 272,801 |  |  |
Assessments and appeals |  | 218,704 |  |  | 252,447 |  |  |
Program administration |  | 66,002 |  |  | 63,734 |  |  |
Other |  | 7,563 |  |  | 10,148 |  |  |
Total Outside the U.S. |  | 498,926 |  |  | 599,130 |  |  |
Total revenue |  | 3,461,537 |  |  | 2,886,815 |  |  |
By contract type
|  | Year ended September 30,
(in thousands) |  | 2020 |  | 2019
Performance-based |  | $ | 1,109,153 |  |  | $ | 1,193,075 |
Cost-plus |  | $ | 1,578,912 |  |  | $ | 1,088,541 |
Fixed price |  | $ | 471,505 |  |  | $ | 441,146 |
Time and materials |  | $ | 301,967 |  |  | $ | 164,053 |
Total revenue |  | $ | 3,461,537 |  |  | $ | 2,886,815 |
By customer type
|  | Year ended September 30,
(in thousands) |  | 2020 |  | 2019
New York State government agencies |  | $ | 355,282 |  |  | $ | 362,724 |
Other U.S. state government agencies |  | 988,945 |  |  | 804,213 |
Total U.S. state government agencies |  | 1,344,227 |  |  | 1,166,937 |
United States Federal Government agencies |  | 1,559,165 |  |  | 1,040,980 |
International government agencies |  | 467,185 |  |  | 558,599 |
Other, including local municipalities and commercial customers |  | 90,960 |  |  | 120,299 |
Total revenue |  | $ | 3,461,537 |  |  | $ | 2,886,815 |
Changes in Contract Assets | Changes in the reserves against accounts receivable were as follows:
|  | Year ended September 30,
(in thousands) |  | 2020 |  | 2019 |  | 2018
Balance at beginning of year |  | $ | 5,382 |  |  | $ | 4,285 |  |  | $ | 6,843 |
Additions to reserve |  | 12,976 |  |  | 4,018 |  |  | 243 |
Deductions |  | (12,307) |  |  | (2,921) |  |  | (2,801) |
Balance at end of year |  | $ | 6,051 |  |  | $ | 5,382 |  |  | $ | 4,285 |

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- Definition Tabular disclosure of receivable, contract asset, and contract liability from contract with customer. Includes, but is not limited to, change in contract asset and contract liability. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130551-203045 + Details
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- Definition Tabular disclosure of disaggregation of revenue into categories depicting how nature, amount, timing, and uncertainty of revenue and cash flows are affected by economic factor. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130545-203045 + Details
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