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Reportable Segments (Tables) | 9 Months Ended
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Jun. 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 |  | Corporate |  | Total
|  | ($ in millions)
Three Months Ended June 30, 2025: |  |  |  |  |  |  |  |  |  |
Revenue |  | $ | 3,277.2 |  |  | $ | 901.1 |  |  | $ | 0.1 |  |  | $ | — |  |  | $ | 4,178.4 |
Gross profit |  | 238.8 |  |  | 88.0 |  |  | 0.1 |  |  | — |  |  | 326.9 |
Equity in earnings of joint ventures |  | 2.2 |  |  | 2.1 |  |  | 1.0 |  |  | — |  |  | 5.3 |
General and administrative expenses |  | — |  |  | — |  |  | (2.3) |  |  | (35.9) |  |  | (38.2) |
Restructuring costs |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Operating income (loss) |  | 241.0 |  |  | 90.1 |  |  | (1.2) |  |  | (35.9) |  |  | 294.0 |
Gross profit as a % of revenue |  | 7.3 | % |  | 9.8 | % |  |  |  |  |  | 7.8 | %
Three Months Ended June 30, 2024: |  |  |  |  |  |  |  |  |  |
Revenue |  | $ | 3,246.9 |  |  | $ | 904.2 |  |  | $ | 0.1 |  |  | $ | — |  |  | $ | 4,151.2 |
Gross profit |  | 203.9 |  |  | 81.1 |  |  | 0.1 |  |  | — |  |  | 285.1 |
Equity in earnings of joint ventures |  | 3.5 |  |  | 3.5 |  |  | 0.7 |  |  | — |  |  | 7.7 |
General and administrative expenses |  | — |  |  | — |  |  | (0.6) |  |  | (35.6) |  |  | (36.2) |
Restructuring costs |  | — |  |  | — |  |  | — |  |  | (29.1) |  |  | (29.1) |
Operating income |  | 207.4 |  |  | 84.6 |  |  | 0.2 |  |  | (64.7) |  |  | 227.5 |
Gross profit as a % of revenue |  | 6.3 | % |  | 9.0 | % |  |  |  |  |  | 6.9 | %
Nine Months Ended June 30, 2025: |  |  |  |  |  |  |  |  |  |
Revenue |  | $ | 9,285.9 |  |  | $ | 2,677.9 |  |  | $ | 0.4 |  |  | $ | — |  |  | $ | 11,964.2 |
Gross profit |  | 641.5 |  |  | 244.2 |  |  | 0.4 |  |  | — |  |  | 886.1 |
Equity in earnings of joint ventures |  | 12.6 |  |  | 9.0 |  |  | 0.1 |  |  | — |  |  | 21.7 |
General and administrative expenses |  | — |  |  | — |  |  | (7.5) |  |  | (111.2) |  |  | (118.7) |
Restructuring costs |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Operating income (loss) |  | 654.1 |  |  | 253.2 |  |  | (7.0) |  |  | (111.2) |  |  | 789.1 |
Gross profit as a % of revenue |  | 6.9 | % |  | 9.1 | % |  |  |  |  |  | 7.4 | %
Nine Months Ended June 30, 2024: |  |  |  |  |  |  |  |  |  |
Revenue |  | $ | 9,324.2 |  |  | $ | 2,670.0 |  |  | $ | 0.8 |  |  | $ | — |  |  | $ | 11,995.0 |
Gross profit |  | 559.3 |  |  | 230.1 |  |  | 0.8 |  |  | — |  |  | 790.2 |
Equity in earnings (losses) of joint ventures |  | 11.9 |  |  | 12.8 |  |  | (26.5) |  |  | — |  |  | (1.8) |
General and administrative expenses |  | — |  |  | — |  |  | (12.7) |  |  | (103.9) |  |  | (116.6) |
Restructuring costs |  | — |  |  | — |  |  | — |  |  | (80.7) |  |  | (80.7) |
Operating income (loss) |  | 571.2 |  |  | 242.9 |  |  | (38.4) |  |  | (184.6) |  |  | 591.1 |
Gross profit as a % of revenue |  | 6.0 | % |  | 8.6 | % |  |  |  |  |  | 6.6 | %
Total assets |  |  |  |  |  |  |  |  |  |
June 30, 2025 |  | $ | 7,864.3 |  |  | $ | 2,830.8 |  |  | $ | 46.8 |  |  | $ | 1,493.4 |  |  |
September 30, 2024 |  | $ | 7,988.1 |  |  | $ | 2,734.5 |  |  | $ | 53.2 |  |  | $ | 1,208.7 |  |  |

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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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