Annual report pursuant to Section 13 and 15(d)

Revenue Recognition - Disaggregation of Revenue (Details)

v3.21.2
Revenue Recognition - Disaggregation of Revenue (Details) - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2019
Disaggregation of Revenue [Line Items]      
Revenue $ 4,254,485 $ 3,461,537 $ 2,886,815
United States      
Disaggregation of Revenue [Line Items]      
Revenue 3,555,394 2,962,611 2,287,685
United Kingdom      
Disaggregation of Revenue [Line Items]      
Revenue 286,432 246,334 293,695
Australia      
Disaggregation of Revenue [Line Items]      
Revenue 244,995 147,156 198,795
Rest of world      
Disaggregation of Revenue [Line Items]      
Revenue 167,664 105,436 106,640
Total U.S. state government agencies      
Disaggregation of Revenue [Line Items]      
Revenue 1,654,555 1,344,227 1,166,937
New York State government agencies      
Disaggregation of Revenue [Line Items]      
Revenue 371,917 355,282 362,724
Other U.S. state government agencies      
Disaggregation of Revenue [Line Items]      
Revenue 1,282,638 988,945 804,213
United States Federal Government agencies      
Disaggregation of Revenue [Line Items]      
Revenue 1,805,131 1,559,165 1,040,980
International government agencies      
Disaggregation of Revenue [Line Items]      
Revenue 663,180 467,185 558,599
Other, including local municipalities and commercial customers      
Disaggregation of Revenue [Line Items]      
Revenue 131,619 90,960 120,299
Performance-based      
Disaggregation of Revenue [Line Items]      
Revenue 1,416,562 1,109,153 1,193,075
Cost-plus      
Disaggregation of Revenue [Line Items]      
Revenue 1,237,995 1,578,912 1,088,541
Fixed price      
Disaggregation of Revenue [Line Items]      
Revenue 553,645 471,505 441,146
Time and materials      
Disaggregation of Revenue [Line Items]      
Revenue 1,046,283 301,967 164,053
U.S. Services      
Disaggregation of Revenue [Line Items]      
Revenue 1,662,110 1,329,274 1,176,488
U.S. Federal Services      
Disaggregation of Revenue [Line Items]      
Revenue 1,893,284 1,633,337 1,111,197
Outside the U.S.      
Disaggregation of Revenue [Line Items]      
Revenue 699,091 498,926 599,130
Workforce services | Outside the U.S.      
Disaggregation of Revenue [Line Items]      
Revenue 358,088 206,657 272,801
Program administration | U.S. Services      
Disaggregation of Revenue [Line Items]      
Revenue 1,154,939 945,125 883,772
Program administration | U.S. Federal Services      
Disaggregation of Revenue [Line Items]      
Revenue 1,273,850 1,288,741 779,573
Program administration | Outside the U.S.      
Disaggregation of Revenue [Line Items]      
Revenue 107,643 66,002 63,734
Technology solutions | U.S. Federal Services      
Disaggregation of Revenue [Line Items]      
Revenue 278,232 169,259 160,342
Assessments and appeals | U.S. Services      
Disaggregation of Revenue [Line Items]      
Revenue 138,297 141,446 136,109
Assessments and appeals | U.S. Federal Services      
Disaggregation of Revenue [Line Items]      
Revenue 341,202 175,337 171,282
Assessments and appeals | Outside the U.S.      
Disaggregation of Revenue [Line Items]      
Revenue 225,314 218,704 252,447
Employment and children services | U.S. Services      
Disaggregation of Revenue [Line Items]      
Revenue 320,653 191,061 100,454
Other | U.S. Services      
Disaggregation of Revenue [Line Items]      
Revenue 48,221 51,642 56,153
Other | Outside the U.S.      
Disaggregation of Revenue [Line Items]      
Revenue $ 8,046 $ 7,563 $ 10,148