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Segment Information - Financial information by segment (Details) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2020 USD ($) | Jun. 30, 2019 USD ($) | Jun. 30, 2020 USD ($) segment | Jun. 30, 2019 USD ($)
Financial information for each of the Company's business segments |  |  |  |
Number of operating segments | segment |  |  | 3 |
Revenue: |  |  |  |
Revenue | $ 901,337 | $ 730,710 | $ 2,537,701 | $ 2,131,849
Gross profit: |  |  |  |
Gross profit | $ 185,603 | $ 174,247 | $ 514,151 | $ 502,934
Gross profit (as a percent) | 20.60% | 23.80% | 20.30% | 23.60%
Selling, general & administrative expense: |  |  |  |
Selling, general and administrative expenses | $ 89,582 | $ 81,604 | $ 283,662 | $ 239,377
Selling, general, and administrative expense (as a percent) | 9.90% | 11.20% | 11.20% | 11.20%
Operating income: |  |  |  |
Operating income | $ 87,309 | $ 83,594 | $ 203,755 | $ 239,531
Operating income (as a percent) | 9.70% | 11.40% | 8.00% | 11.20%
Amortization of intangible assets | $ (8,712) | $ (9,049) | $ (26,734) | $ (24,026)
Gain on sale of a business |  |  | 1,706 | 0
Segment Reconciling Items |  |  |  |
Selling, general & administrative expense: |  |  |  |
Selling, general and administrative expenses | 134 | 503 | 4,155 | 2,201
Operating income: |  |  |  |
Amortization of intangible assets | (8,712) | (9,049) | (26,734) | (24,026)
Gain on sale of a business | 1,706 | 0 | 1,706 | 0
Other operating income (loss) | (134) | (503) | (4,155) | (2,201)
U.S. Health & Human Services |  |  |  |
Revenue: |  |  |  |
Revenue | 336,950 | 291,132 | 957,929 | 876,082
U.S. Health & Human Services | Operating Segments |  |  |  |
Revenue: |  |  |  |
Revenue | 336,950 | 291,132 | 957,929 | 876,082
Gross profit: |  |  |  |
Gross profit | $ 93,029 | $ 86,664 | $ 268,073 | $ 260,955
Gross profit (as a percent) | 27.60% | 29.80% | 28.00% | 29.80%
Selling, general & administrative expense: |  |  |  |
Selling, general and administrative expenses | $ 31,996 | $ 32,414 | $ 102,633 | $ 93,953
Selling, general, and administrative expense (as a percent) | 9.50% | 11.10% | 10.70% | 10.70%
Operating income: |  |  |  |
Operating income | $ 61,033 | $ 54,250 | $ 165,440 | $ 167,002
Operating income (as a percent) | 18.10% | 18.60% | 17.30% | 19.10%
U.S. Federal Services |  |  |  |
Revenue: |  |  |  |
Revenue | $ 450,143 | $ 292,295 | $ 1,210,105 | $ 799,018
U.S. Federal Services | Operating Segments |  |  |  |
Revenue: |  |  |  |
Revenue | 450,143 | 292,295 | 1,210,105 | 799,018
Gross profit: |  |  |  |
Gross profit | $ 84,723 | $ 66,803 | $ 232,502 | $ 175,484
Gross profit (as a percent) | 18.80% | 22.90% | 19.20% | 22.00%
Selling, general & administrative expense: |  |  |  |
Selling, general and administrative expenses | $ 45,490 | $ 32,896 | $ 131,455 | $ 90,632
Selling, general, and administrative expense (as a percent) | 10.10% | 11.30% | 10.90% | 11.30%
Operating income: |  |  |  |
Operating income | $ 39,233 | $ 33,907 | $ 101,047 | $ 84,852
Operating income (as a percent) | 8.70% | 11.60% | 8.40% | 10.60%
Outside the U.S. |  |  |  |
Revenue: |  |  |  |
Revenue | $ 114,244 | $ 147,283 | $ 369,667 | $ 456,749
Outside the U.S. | Operating Segments |  |  |  |
Revenue: |  |  |  |
Revenue | 114,244 | 147,283 | 369,667 | 456,749
Gross profit: |  |  |  |
Gross profit | $ 7,851 | $ 20,780 | $ 13,576 | $ 66,495
Gross profit (as a percent) | 6.90% | 14.10% | 3.70% | 14.60%
Selling, general & administrative expense: |  |  |  |
Selling, general and administrative expenses | $ 13,668 | $ 15,791 | $ 47,125 | $ 52,591
Selling, general, and administrative expense (as a percent) | 12.00% | 10.70% | 12.70% | 11.50%
Operating income: |  |  |  |
Operating income | $ (5,817) | $ 4,989 | $ (33,549) | $ 13,904
Operating income (as a percent) | (5.10%) | 3.40% | (9.10%) | 3.00%

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