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Business Segments - Financial information by segment (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Revenue: |  |  |  |
Revenue | $ 1,314,929 | $ 1,188,677 | $ 3,990,327 | $ 3,644,775
Gross profit: |  |  |  |
Gross profit | $ 332,314 | $ 264,364 | $ 949,957 | $ 737,714
Gross profit (as a percent) | 25.30% | 22.20% | 23.80% | 20.20%
Selling, general, and administrative expenses: |  |  |  |
Selling, general, and administrative expenses | $ 167,033 | $ 182,545 | $ 504,682 | $ 471,445
Selling, general, and administrative expenses (as a percent) | 12.70% | 15.40% | 12.60% | 12.90%
Divestiture-related charges |  |  | $ 1,018 | $ 883
Operating income/(loss): |  |  |  |
Operating income | $ 141,739 | $ 58,388 | $ 376,743 | $ 195,670
Operating income (as a percent) | 10.80% | 4.90% | 9.40% | 5.40%
Amortization of Intangible Assets | $ (23,542) | $ (23,431) | $ (68,532) | $ (70,599)
Operating Segments | U.S. Federal Services |  |  |  |
Revenue: |  |  |  |
Revenue | 683,347 | 583,960 | 2,062,127 | 1,786,202
Gross profit: |  |  |  |
Gross profit | $ 186,075 | $ 156,945 | $ 506,074 | $ 402,513
Gross profit (as a percent) | 27.20% | 26.90% | 24.50% | 22.50%
Selling, general, and administrative expenses: |  |  |  |
Selling, general, and administrative expenses | $ 79,949 | $ 82,892 | $ 247,671 | $ 229,591
Selling, general, and administrative expenses (as a percent) | 11.70% | 14.20% | 12.00% | 12.90%
Operating income/(loss): |  |  |  |
Operating income | $ 106,126 | $ 74,053 | $ 258,403 | $ 172,922
Operating income (as a percent) | 15.50% | 12.70% | 12.50% | 9.70%
Operating Segments | U.S. Services |  |  |  |
Revenue: |  |  |  |
Revenue | $ 472,298 | $ 449,061 | $ 1,448,258 | $ 1,338,242
Gross profit: |  |  |  |
Gross profit | $ 121,012 | $ 98,538 | $ 369,497 | $ 268,152
Gross profit (as a percent) | 25.60% | 21.90% | 25.50% | 20.00%
Selling, general, and administrative expenses: |  |  |  |
Selling, general, and administrative expenses | $ 59,531 | $ 51,536 | $ 174,032 | $ 140,793
Selling, general, and administrative expenses (as a percent) | 12.60% | 11.50% | 12.00% | 10.50%
Operating income/(loss): |  |  |  |
Operating income | $ 61,481 | $ 47,002 | $ 195,465 | $ 127,359
Operating income (as a percent) | 13.00% | 10.50% | 13.50% | 9.50%
Operating Segments | Outside the U.S. |  |  |  |
Revenue: |  |  |  |
Revenue | $ 159,284 | $ 155,656 | $ 479,942 | $ 520,331
Gross profit: |  |  |  |
Gross profit | $ 25,227 | $ 8,881 | $ 74,386 | $ 67,049
Gross profit (as a percent) | 15.80% | 5.70% | 15.50% | 12.90%
Selling, general, and administrative expenses: |  |  |  |
Selling, general, and administrative expenses | $ 26,647 | $ 24,122 | $ 75,249 | $ 75,936
Selling, general, and administrative expenses (as a percent) | 16.70% | 15.50% | 15.70% | 14.60%
Operating income/(loss): |  |  |  |
Operating income | $ (1,420) | $ (15,241) | $ (863) | $ (8,887)
Operating income (as a percent) | (0.90%) | (9.80%) | (0.20%) | (1.70%)
Segment Reconciling Items |  |  |  |
Selling, general, and administrative expenses: |  |  |  |
Selling, general, and administrative expenses | $ 906 | $ 23,995 | $ 6,712 | $ 24,242
Divestiture-related charges | 0 | 0 | 1,018 | 883
Operating income/(loss): |  |  |  |
Operating income | (906) | (23,995) | (6,712) | (24,242)
Amortization of Intangible Assets | (23,542) | (23,431) | (68,532) | (70,599)
Other expense | $ 300 | $ 22,100 | $ 3,300 | $ 22,100

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