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v3.21.2

Segment Information - Financial information by segment (Details) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2021 USD ($) | Jun. 30, 2020 USD ($) | Jun. 30, 2021 USD ($) segment state | Jun. 30, 2020 USD ($)
Financial information for each of the Company's business segments |  |  |  |
Number of operating segments | segment |  |  | 3 |
Number of states supported in unemployment insurance programs (more than) | state |  |  | 15 |
Revenue: |  |  |  |
Revenue | $ 1,243,520 | $ 901,337 | $ 3,148,354 | $ 2,537,701
Gross profit: |  |  |  |
Gross profit | $ 291,856 | $ 185,603 | $ 728,569 | $ 514,151
Gross profit (as a percent) | 23.50% | 20.60% | 23.10% | 20.30%
Selling, general & administrative expense: |  |  |  |
Selling, general, and administrative expenses | $ 140,129 | $ 89,582 | $ 364,498 | $ 283,662
Selling, general, and administrative expense (as a percent) | 11.30% | 9.90% | 11.60% | 11.20%
Gain on sale of a business |  |  | $ 0 | $ 1,706
Operating income: |  |  |  |
Operating income | $ 139,595 | $ 87,309 | $ 340,353 | $ 203,755
Operating income (as a percent) |  | 9.70% | 10.80% | 8.00%
Amortization of intangible assets | (12,132) | $ (8,712) | $ (23,718) | $ (26,734)
Acquisition-related expenses |  |  | 8,800 |
Segment Reconciling Items |  |  |  |
Selling, general & administrative expense: |  |  |  |
Selling, general, and administrative expenses | 4,903 | 134 | 9,948 | 4,155
Gain on sale of a business | 0 | 1,706 | 0 | 1,706
Operating income: |  |  |  |
Amortization of intangible assets | (12,132) | (8,712) | (23,718) | (26,734)
Other | (4,903) | (134) | (9,948) | (4,155)
Acquisition-related expenses | 5,600 |  | 8,800 |
U.S. Services |  |  |  |
Revenue: |  |  |  |
Revenue | 436,338 | 336,950 | 1,269,487 | 957,929
U.S. Services | Operating Segments |  |  |  |
Revenue: |  |  |  |
Revenue | 436,338 | 336,950 | 1,269,487 | 957,929
Gross profit: |  |  |  |
Gross profit | $ 104,814 | $ 93,029 | $ 323,256 | $ 268,073
Gross profit (as a percent) | 24.00% | 27.60% | 25.50% | 28.00%
Selling, general & administrative expense: |  |  |  |
Selling, general, and administrative expenses | $ 42,606 | $ 31,996 | $ 116,655 | $ 102,633
Selling, general, and administrative expense (as a percent) | 9.80% | 9.50% | 9.20% | 10.70%
Operating income: |  |  |  |
Operating income | $ 62,208 | $ 61,033 | $ 206,601 | $ 165,440
Operating income (as a percent) | 14.30% | 18.10% | 16.30% | 17.30%
U.S. Federal Services |  |  |  |
Revenue: |  |  |  |
Revenue | $ 617,601 | $ 450,143 | $ 1,352,982 | $ 1,210,105
U.S. Federal Services | Operating Segments |  |  |  |
Revenue: |  |  |  |
Revenue | 617,601 | 450,143 | 1,352,982 | 1,210,105
Gross profit: |  |  |  |
Gross profit | $ 155,776 | $ 84,723 | $ 312,405 | $ 232,502
Gross profit (as a percent) | 25.20% | 18.80% | 23.10% | 19.20%
Selling, general & administrative expense: |  |  |  |
Selling, general, and administrative expenses | $ 69,647 | $ 45,490 | $ 172,877 | $ 131,455
Selling, general, and administrative expense (as a percent) | 11.30% | 10.10% | 12.80% | 10.90%
Operating income: |  |  |  |
Operating income | $ 86,129 | $ 39,233 | $ 139,528 | $ 101,047
Operating income (as a percent) | 13.90% | 8.70% | 10.30% | 8.40%
Outside the U.S. |  |  |  |
Revenue: |  |  |  |
Revenue | $ 189,581 | $ 114,244 | $ 525,885 | $ 369,667
Outside the U.S. | Operating Segments |  |  |  |
Revenue: |  |  |  |
Revenue | 189,581 | 114,244 | 525,885 | 369,667
Gross profit: |  |  |  |
Gross profit | $ 31,266 | $ 7,851 | $ 92,908 | $ 13,576
Gross profit (as a percent) | 16.50% | 6.90% | 17.70% | 3.70%
Selling, general & administrative expense: |  |  |  |
Selling, general, and administrative expenses | $ 22,973 | $ 13,668 | $ 65,018 | $ 47,125
Selling, general, and administrative expense (as a percent) | 12.10% | 12.00% | 12.40% | 12.70%
Operating income: |  |  |  |
Operating income | $ 8,293 | $ (5,817) | $ 27,890 | $ (33,549)
Operating income (as a percent) | 4.40% | (5.10%) | 5.30% | (9.10%)

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