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Reportable Segments and Geographic Information (Tables) | 12 Months Ended
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Sep. 30, 2025
Segment Reporting [Abstract] |
Schedule of Financial Information Concerning the Company's Reportable Segments | The following tables set forth summarized financial information concerning the Company’s reportable segments:
Reportable Segments: |  | Americas |  | International |  | AECOM Capital |  | Total
($ in millions) |  |  |  |  |  |  |  |
Fiscal Year Ended September 30, 2025: |  |  |  |  |  |  |  |
Revenue |  | $ | 12,525.9 |  |  | $ | 3,613.2 |  |  | $ | 0.5 |  |  | $ | 16,139.6 |
Subcontractor and other direct costs |  | (7,973.7) |  |  | (593.1) |  |  | — |  |  | (8,566.8) |
Employee compensation expense |  | (3,089.4) |  |  | (2,286.1) |  |  | — |  |  | (5,375.5) |
Equity in earnings (losses) of joint ventures |  | 15.8 |  |  | 11.8 |  |  | (0.6) |  |  | 27.0 |
Other segment items |  | (609.7) |  |  | (424.4) |  |  | (8.9) |  |  | (1,043.0) |
Earnings before income taxes and amortization |  | $ | 868.9 |  |  | $ | 321.4 |  |  | $ | (9.0) |  |  | $ | 1,181.3 |
Fiscal Year Ended September 30, 2024: |  |  |  |  |  |  |  |
Revenue |  | $ | 12,485.7 |  |  | $ | 3,618.4 |  |  | $ | 1.4 |  |  | $ | 16,105.5 |
Subcontractor and other direct costs |  | (8,281.1) |  |  | (659.4) |  |  | — |  |  | (8,940.5) |
Employee compensation expense |  | (2,929.0) |  |  | (2,234.4) |  |  | (2.7) |  |  | (5,166.1) |
Equity in earnings (losses) of joint ventures |  | 15.5 |  |  | 13.5 |  |  | (26.9) |  |  | 2.1 |
Other segment items |  | (514.9) |  |  | (427.4) |  |  | (12.3) |  |  | (954.6) |
Earnings before income taxes and amortization |  | $ | 776.2 |  |  | $ | 310.7 |  |  | $ | (40.5) |  |  | $ | 1,046.4 |
Fiscal Year Ended September 30, 2023: |  |  |  |  |  |  |  |
Revenue |  | $ | 10,975.7 |  |  | $ | 3,402.1 |  |  | $ | 0.7 |  |  | $ | 14,378.5 |
Subcontractor and other direct costs |  | (7,056.7) |  |  | (619.0) |  |  | — |  |  | (7,675.7) |
Employee compensation expense |  | (2,729.9) |  |  | (2,134.5) |  |  | (5.9) |  |  | (4,870.3) |
Equity in earnings (losses) of joint ventures |  | 14.8 |  |  | 9.7 |  |  | (303.9) |  |  | (279.4) |
Other segment items |  | (482.3) |  |  | (421.7) |  |  | (6.7) |  |  | (910.7) |
Earnings before income taxes and amortization |  | $ | 721.6 |  |  | $ | 236.6 |  |  | $ | (315.8) |  |  | $ | 642.4 |
Other segment items include rent expenses, depreciation, nonoperating income, and a deduction for earnings attributable to noncontrolling interests as well as other costs. The table below reconciles total segment attributable earnings before taxes and amortization to income from continuing operations before taxes:
|  | Fiscal Year Ended
|  | September 30, 2025 |  | September 30, 2024 |  | September 30, 2023
|  | (in millions)
Total segment attributable earnings before taxes and amortization |  | $ | 1,181.3 |  |  | $ | 1,046.4 |  |  | $ | 642.4 |
Corporate general and administrative expenses |  | (148.9) |  |  | (145.1) |  |  | (141.0) |
Restructuring and acquisition costs |  | (59.4) |  |  | (98.9) |  |  | (188.4) |
Other income |  | (2.5) |  |  | 2.1 |  |  | (5.3) |
Interest income |  | 62.9 |  |  | 58.6 |  |  | 40.3 |
Interest expense |  | (184.3) |  |  | (185.4) |  |  | (159.3) |
Amortization expense |  | (2.2) |  |  | (18.8) |  |  | (18.6) |
Income attributable to noncontrolling interests from continuing operations |  | 68.7 |  |  | 59.3 |  |  | 43.3 |
Income from continuing operations before taxes |  | $ | 915.6 |  |  | $ | 718.2 |  |  | $ | 213.4 |
Reportable Segments: |  | Americas |  | International |  | AECOM Capital |  | Corporate and Assets Held for Sale |  | Total
|  | (in millions)
Fiscal Year Ended September 30, 2025: |  |  |  |  |  |  |  |  |  |
Total assets |  | $ | 7,866.9 |  |  | $ | 2,702.9 |  |  | $ | 41.6 |  |  | $ | 1,588.8 |  |  | $ | 12,200.2 |
Investments in unconsolidated joint ventures |  | 44.0 |  |  | 56.6 |  |  | 37.5 |  |  | — |  |  | 138.1 |
Depreciation and amortization |  | (94.3) |  |  | (70.8) |  |  | — |  |  | (10.8) |  |  | (175.9) |
Fiscal Year Ended September 30, 2024: |  |  |  |  |  |  |  |  |  |
Total assets |  | $ | 7,988.1 |  |  | $ | 2,734.5 |  |  | $ | 53.2 |  |  | $ | 1,285.9 |  |  | $ | 12,061.7 |
Investment in unconsolidated joint ventures |  | 34.1 |  | 61.1 |  | 42.9 |  | — |  |  | 138.1 |
Depreciation and amortization |  | (101.6) |  |  | (67.2) |  |  | — |  |  | (10.0) |  |  | (178.8) |
Fiscal Year Ended September 30, 2023: |  |  |  |  |  |  |  |  |  |
Depreciation and amortization |  | (100.6) |  |  | (67.2) |  |  | — |  |  | (7.9) |  |  | (175.7) |
Schedule of Geographic Information |
|  | Fiscal Year Ended
Long-Lived Assets |  | September 30, 2025 |  | September 30, 2024 |  | September 30, 2023
|  | (in millions)
Americas |  | $ | 3,779.2 |  |  | $ | 3,315.3 |  |  | $ | 3,478.5 |
Europe, Middle East, India, Africa |  | 1,025.5 |  |  | 872.9 |  |  | 803.5 |
Asia-Australia-Pacific |  | 351.1 |  |  | 370.7 |  |  | 342.3 |
Total |  | $ | 5,155.8 |  |  | $ | 4,558.9 |  |  | $ | 4,624.3 |

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- Definition Tabular disclosure of information concerning material long-lived assets (excluding financial instruments, customer relationships with financial institutions, mortgage and other servicing rights, deferred policy acquisition costs, and deferred taxes assets) located in identified geographic areas and/or the amount of revenue from external customers attributed to that country from which revenue is material. An entity may also provide subtotals of geographic information about groups of countries. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(1)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147483621/220-10-S99-2 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 41 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-41 + Details
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- Definition Tabular disclosure of the profit or loss and total assets for each reportable segment. An entity discloses certain information on each reportable segment if the amounts (a) are included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) are otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or loss. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 25 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-25 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-22 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 30 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-30 + Details
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