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Business Segments - Financial information by segment (Details) $ in Thousands | 3 Months Ended
--- | ---
Dec. 31, 2022 USD ($) segment | Dec. 31, 2021 USD ($)
Financial information for each of the Company's business segments |  |
Number of operating segments | segment | 3 |
Revenue: |  |
Revenue | $ 1,249,246 | $ 1,150,876
Gross profit: |  |
Gross profit | $ 244,747 | $ 228,155
Gross profit (as a percent) | 19.60% | 19.80%
Selling, general, and administrative expenses: |  |
Selling, general, and administrative expenses | $ 146,452 | $ 124,221
Selling, general, and administrative expense (as a percent) | 11.70% | 10.80%
Operating income: |  |
Operating income | $ 74,777 | $ 81,529
Operating income (as a percent) | 6.00% | 7.10%
Amortization of intangible assets | $ (23,518) | $ (22,405)
Segment Reconciling Items |  |
Selling, general, and administrative expenses: |  |
Selling, general, and administrative expenses | 572 | 2,854
Operating income: |  |
Amortization of intangible assets | (23,518) | (22,405)
U.S. Federal Services | Operating Segments |  |
Revenue: |  |
Revenue | 618,167 | 581,871
Gross profit: |  |
Gross profit | $ 122,694 | $ 126,576
Gross profit (as a percent) | 19.80% | 21.80%
Selling, general, and administrative expenses: |  |
Selling, general, and administrative expenses | $ 71,649 | $ 64,925
Selling, general, and administrative expense (as a percent) | 11.60% | 11.20%
Operating income: |  |
Operating income | $ 51,045 | $ 61,651
Operating income (as a percent) | 8.30% | 10.60%
U.S. Services | Operating Segments |  |
Revenue: |  |
Revenue | $ 439,478 | $ 386,417
Gross profit: |  |
Gross profit | $ 83,598 | $ 89,699
Gross profit (as a percent) | 19.00% | 23.20%
Selling, general, and administrative expenses: |  |
Selling, general, and administrative expenses | $ 45,842 | $ 35,102
Selling, general, and administrative expense (as a percent) | 10.40% | 9.10%
Operating income: |  |
Operating income | $ 37,756 | $ 54,597
Operating income (as a percent) | 8.60% | 14.10%
Outside the U.S. | Operating Segments |  |
Revenue: |  |
Revenue | $ 191,601 | $ 182,588
Gross profit: |  |
Gross profit | $ 38,455 | $ 11,880
Gross profit (as a percent) | 20.10% | 6.50%
Selling, general, and administrative expenses: |  |
Selling, general, and administrative expenses | $ 28,389 | $ 21,340
Selling, general, and administrative expense (as a percent) | 14.80% | 11.70%
Operating income: |  |
Operating income | $ 10,066 | $ (9,460)
Operating income (as a percent) | 5.30% | (5.20%)
Other | Operating Segments |  |
Operating income: |  |
Operating income | $ (572) | $ (2,854)

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