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Business Segments - Financial information by segment (Details) $ in Thousands |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Feb. 14, 2024 segment | Mar. 31, 2024 USD ($) | Mar. 31, 2023 USD ($) | Mar. 31, 2024 USD ($) segment | Mar. 31, 2023 USD ($)
Financial information for each of the Company's business segments |  |  |  |  |
Number of operating segments | segment | 3 |  |  | 3 |
Revenue: |  |  |  |  |
Revenue |  | $ 1,348,357 | $ 1,206,852 | $ 2,675,398 | $ 2,456,098
Gross profit: |  |  |  |  |
Gross profit |  | $ 317,589 | $ 228,603 | $ 617,643 | $ 473,350
Gross profit (as a percent) |  | 23.60% | 18.90% | 23.10% | 19.30%
Selling, general, and administrative expenses: |  |  |  |  |
Selling, general, and administrative expenses |  | $ 168,454 | $ 142,448 | $ 337,649 | $ 288,900
Selling, general, and administrative expenses (as a percent) |  | 12.50% | 11.80% | 12.60% | 11.80%
Divestiture-related charges |  |  |  | $ 1,018 | $ 883
Operating income/(loss): |  |  |  |  |
Operating income |  | $ 127,494 | $ 62,505 | $ 235,004 | $ 137,282
Operating income (as a percent) |  | 9.50% | 5.20% | 8.80% | 5.60%
Amortization of Intangible Assets |  | $ (21,641) | $ (23,650) | $ (44,990) | $ (47,168)
Operating Segments | U.S. Federal Services |  |  |  |  |
Revenue: |  |  |  |  |
Revenue |  | 701,702 | 584,075 | 1,378,780 | 1,202,242
Gross profit: |  |  |  |  |
Gross profit |  | $ 163,337 | $ 122,874 | $ 319,999 | $ 245,568
Gross profit (as a percent) |  | 23.30% | 21.00% | 23.20% | 20.40%
Selling, general, and administrative expenses: |  |  |  |  |
Selling, general, and administrative expenses |  | $ 79,867 | $ 75,050 | $ 167,722 | $ 146,699
Selling, general, and administrative expenses (as a percent) |  | 11.40% | 12.80% | 12.20% | 12.20%
Operating income/(loss): |  |  |  |  |
Operating income |  | $ 83,470 | $ 47,824 | $ 152,277 | $ 98,869
Operating income (as a percent) |  | 11.90% | 8.20% | 11.00% | 8.20%
Operating Segments | U.S. Services |  |  |  |  |
Revenue: |  |  |  |  |
Revenue |  | $ 486,115 | $ 449,703 | $ 975,960 | $ 889,181
Gross profit: |  |  |  |  |
Gross profit |  | $ 130,122 | $ 86,016 | $ 248,485 | $ 169,614
Gross profit (as a percent) |  | 26.80% | 19.10% | 25.50% | 19.10%
Selling, general, and administrative expenses: |  |  |  |  |
Selling, general, and administrative expenses |  | $ 62,201 | $ 43,415 | $ 114,501 | $ 89,257
Selling, general, and administrative expenses (as a percent) |  | 12.80% | 9.70% | 11.70% | 10.00%
Operating income/(loss): |  |  |  |  |
Operating income |  | $ 67,921 | $ 42,601 | $ 133,984 | $ 80,357
Operating income (as a percent) |  | 14.00% | 9.50% | 13.70% | 9.00%
Operating Segments | Outside the U.S. |  |  |  |  |
Revenue: |  |  |  |  |
Revenue |  | $ 160,540 | $ 173,074 | $ 320,658 | $ 364,675
Gross profit: |  |  |  |  |
Gross profit |  | $ 24,130 | $ 19,713 | $ 49,159 | $ 58,168
Gross profit (as a percent) |  | 15.00% | 11.40% | 15.30% | 16.00%
Selling, general, and administrative expenses: |  |  |  |  |
Selling, general, and administrative expenses |  | $ 23,460 | $ 23,425 | $ 48,601 | $ 51,814
Selling, general, and administrative expenses (as a percent) |  | 14.60% | 13.50% | 15.20% | 14.20%
Operating income/(loss): |  |  |  |  |
Operating income |  | $ 670 | $ (3,712) | $ 558 | $ 6,354
Operating income (as a percent) |  | 0.40% | (2.10%) | 0.20% | 1.70%
Segment Reconciling Items |  |  |  |  |
Selling, general, and administrative expenses: |  |  |  |  |
Selling, general, and administrative expenses |  | $ 2,926 | $ (325) | $ 5,807 | $ 247
Divestiture-related charges |  | 0 | 883 | 1,018 | 883
Operating income/(loss): |  |  |  |  |
Amortization of Intangible Assets |  | (21,641) | (23,650) | (44,990) | (47,168)
Other |  | $ (2,926) | $ 325 | $ (5,807) | $ (247)

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