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Business Segments - Financial information by segment (Details) $ in Thousands |  | 12 Months Ended
--- | --- | ---
Feb. 14, 2024 segment | Sep. 30, 2024 USD ($) segment | Sep. 30, 2023 USD ($) | Sep. 30, 2022 USD ($)
Financial information for each of the Company's business segments |  |  |  |
Number of operating segments | segment | 3 | 3 |  |
Revenue: |  |  |  |
Revenue |  | $ 5,306,197 | $ 4,904,728 | $ 4,631,018
Gross profit: |  |  |  |
Gross profit |  | $ 1,251,652 | $ 1,028,608 | $ 939,810
Gross profit (as a percent) |  | 23.60% | 21.00% | 20.30%
Selling, general, and administrative expenses: |  |  |  |
Selling, general, and administrative expenses |  | $ 671,583 | $ 639,223 | $ 534,493
Selling, general, and administrative expense (as a percent) |  | 12.70% | 13.00% | 11.50%
Divestiture related charges |  | $ 1,018 | $ 883 | $ 0
Operating income/(loss): |  |  |  |
Operating income |  | $ 488,499 | $ 294,794 | $ 325,898
Operating income (as a percent) |  | 9.20% | 6.00% | 7.00%
Amortization of intangible assets |  | $ (91,570) | $ (94,591) | $ (90,465)
Divestiture related charges |  | (1,018) | (883) | 0
Gain on sale of land and building |  | 0 | 0 | 11,046
Depreciation and amortization: |  |  |  |
Depreciation and amortization |  | $ 33,957 | $ 54,725 | $ 42,330
Depreciation and amortization (as a percent) |  | 0.60% | 1.10% | 0.90%
Land and Building |  |  |  |
Operating income/(loss): |  |  |  |
Gain on sale of land and building |  |  |  | $ 11,000
Segment Reconciling Items |  |  |  |
Selling, general, and administrative expenses: |  |  |  |
Selling, general, and administrative expenses |  | $ 7,222 | $ 29,973 | (3,454)
Divestiture related charges |  | 1,018 | 3,751 | 0
Operating income/(loss): |  |  |  |
Amortization of intangible assets |  | (91,570) | (94,591) | (90,465)
Divestiture related charges |  | (1,018) | (3,751) | 0
Gain on sale of land and building |  | 0 | 0 | 11,046
Other |  | (7,222) | (29,973) | 3,454
Segment Reconciling Items | MOVEit |  |  |  |
Operating income/(loss): |  |  |  |
Other |  | (2,900) | (29,300) |
U.S. Federal Services | Operating Segments |  |  |  |
Revenue: |  |  |  |
Revenue |  | 2,737,244 | 2,403,606 | 2,259,744
Gross profit: |  |  |  |
Gross profit |  | $ 665,762 | $ 557,886 | $ 519,440
Gross profit (as a percent) |  | 24.30% | 23.20% | 23.00%
Selling, general, and administrative expenses: |  |  |  |
Selling, general, and administrative expenses |  | $ 332,140 | $ 308,197 | $ 284,509
Selling, general, and administrative expense (as a percent) |  | 12.10% | 12.80% | 12.60%
Operating income/(loss): |  |  |  |
Operating income |  | $ 333,622 | $ 249,689 | $ 234,931
Operating income (as a percent) |  | 12.20% | 10.40% | 10.40%
Depreciation and amortization: |  |  |  |
Depreciation and amortization |  | $ 10,503 | $ 18,336 | $ 12,332
Depreciation and amortization (as a percent) |  | 0.40% | 0.80% | 0.50%
U.S. Services | Operating Segments |  |  |  |
Revenue: |  |  |  |
Revenue |  | $ 1,911,813 | $ 1,812,069 | $ 1,607,612
Gross profit: |  |  |  |
Gross profit |  | $ 479,787 | $ 377,541 | $ 343,004
Gross profit (as a percent) |  | 25.10% | 20.80% | 21.30%
Selling, general, and administrative expenses: |  |  |  |
Selling, general, and administrative expenses |  | $ 232,805 | $ 194,991 | $ 160,902
Selling, general, and administrative expense (as a percent) |  | 12.20% | 10.80% | 10.00%
Operating income/(loss): |  |  |  |
Operating income |  | $ 246,982 | $ 182,550 | $ 182,102
Operating income (as a percent) |  | 12.90% | 10.10% | 11.30%
Depreciation and amortization: |  |  |  |
Depreciation and amortization |  | $ 16,079 | $ 22,674 | $ 16,528
Depreciation and amortization (as a percent) |  | 0.80% | 1.30% | 1.00%
Outside the U.S. | Operating Segments |  |  |  |
Revenue: |  |  |  |
Revenue |  | $ 657,140 | $ 689,053 | $ 763,662
Gross profit: |  |  |  |
Gross profit |  | $ 106,103 | $ 93,181 | $ 77,366
Gross profit (as a percent) |  | 16.10% | 13.50% | 10.10%
Selling, general, and administrative expenses: |  |  |  |
Selling, general, and administrative expenses |  | $ 98,398 | $ 102,311 | $ 92,536
Selling, general, and administrative expense (as a percent) |  | 15.00% | 14.80% | 12.10%
Operating income/(loss): |  |  |  |
Operating income |  | $ 7,705 | $ (9,130) | $ (15,170)
Operating income (as a percent) |  | 1.20% | (1.30%) | (2.00%)
Depreciation and amortization: |  |  |  |
Depreciation and amortization |  | $ 7,375 | $ 13,715 | $ 13,470
Depreciation and amortization (as a percent) |  | 1.10% | 2.00% | 1.80%

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