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Business Segments - Financial Information by Segment (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023
Revenue: |  |
Revenue | $ 1,402,675 | $ 1,327,041
Gross profit: |  |
Gross profit | $ 301,557 | $ 300,054
Gross profit (as a percent) | 21.50% | 22.60%
Selling, general, and administrative expenses: |  |
Selling, general, and administrative expenses | $ 191,735 | $ 169,195
Selling, general, and administrative expenses (as a percent) | 13.70% | 12.70%
Divestiture-related charges | $ 38,341 | $ 1,018
Operating income/(loss): |  |
Operating income | $ 86,787 | $ 107,510
Operating income (as a percent) | 6.20% | 8.10%
Amortization of Intangible Assets | $ (23,035) | $ (23,349)
Divestiture-related charges | (38,341) | (1,018)
Operating Segments | U.S. Federal Services |  |
Revenue: |  |
Revenue | 780,655 | 677,078
Gross profit: |  |
Gross profit | $ 173,315 | $ 156,662
Gross profit (as a percent) | 22.20% | 23.10%
Selling, general, and administrative expenses: |  |
Selling, general, and administrative expenses | $ 74,215 | $ 87,855
Selling, general, and administrative expenses (as a percent) | 9.50% | 13.00%
Operating income/(loss): |  |
Operating income | $ 99,100 | $ 68,807
Operating income (as a percent) | 12.70% | 10.20%
Operating Segments | U.S. Services |  |
Revenue: |  |
Revenue | $ 452,250 | $ 489,845
Gross profit: |  |
Gross profit | $ 95,004 | $ 118,363
Gross profit (as a percent) | 21.00% | 24.20%
Selling, general, and administrative expenses: |  |
Selling, general, and administrative expenses | $ 54,158 | $ 52,300
Selling, general, and administrative expenses (as a percent) | 12.00% | 10.70%
Operating income/(loss): |  |
Operating income | $ 40,846 | $ 66,063
Operating income (as a percent) | 9.00% | 13.50%
Operating Segments | Outside the U.S. |  |
Revenue: |  |
Revenue | $ 169,770 | $ 160,118
Gross profit: |  |
Gross profit | $ 33,238 | $ 25,029
Gross profit (as a percent) | 19.60% | 15.60%
Selling, general, and administrative expenses: |  |
Selling, general, and administrative expenses | $ 25,118 | $ 25,141
Selling, general, and administrative expenses (as a percent) | 14.80% | 15.70%
Operating income/(loss): |  |
Operating income | $ 8,120 | $ (112)
Operating income (as a percent) | 4.80% | (0.10%)
Segment Reconciling Items |  |
Selling, general, and administrative expenses: |  |
Selling, general, and administrative expenses | $ (97) | $ 2,881
Divestiture-related charges | 38,341 | 1,018
Operating income/(loss): |  |
Amortization of Intangible Assets | (23,035) | (23,349)
Divestiture-related charges | (38,341) | (1,018)
Other | $ 97 | $ (2,881)

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