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Reportable Segments (Tables)
 6 Months Ended
Mar. 31, 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		CorporateTotal
($ in millions)
Three Months Ended March 31, 2025:
Revenue $2,896.7 $874.8 $0.1 $— $3,771.6 
Gross profit 212.5 78.2 0.1 — 290.8 
Equity in earnings of joint ventures 4.9 4.0 (2.1)— 6.8 
General and administrative expenses — — (2.8)(37.2)(40.0)
Restructuring costs— — — — — 
Operating income (loss)217.4 82.2 (4.8)(37.2)257.6 
Gross profit as a % of revenue7.3 %8.9 %7.7 %
 
Three Months Ended March 31, 2024:
Revenue $3,038.6 $904.8 $0.5 $— $3,943.9 
Gross profit 184.4 76.2 0.5 — 261.1 
Equity in earnings of joint ventures4.8 5.0 9.7 — 19.5 
General and administrative expenses — — (9.7)(35.0)(44.7)
Restructuring costs— — — (35.4)(35.4)
Operating income189.2 81.2 0.5 (70.4)200.5 
Gross profit as a % of revenue6.1 %8.4 %6.6 %
Six Months Ended March 31, 2025:
Revenue $6,008.7 $1,776.8 $0.3 $— $7,785.8 
Gross profit 402.7 156.2 0.3 — 559.2 
Equity in earnings (losses) of joint ventures10.4 6.9 (0.9)— 16.4 
General and administrative expenses — — (5.2)(75.3)(80.5)
Restructuring costs — — — — — 
Operating income (loss) 413.1 163.1 (5.8)(75.3)495.1 
Gross profit as a % of revenue 6.7 %8.8 %7.2 %
Six Months Ended March 31, 2024:
Revenue $6,077.3 $1,765.8 $0.7 $— $7,843.8 
Gross profit 355.4 149.0 0.7 — 505.1 
Equity in earnings (losses) of joint ventures8.4 9.3 (27.2)— (9.5)
General and administrative expenses — — (12.1)(68.3)(80.4)
Restructuring costs — — — (51.6)(51.6)
Operating income (loss)363.8 158.3 (38.6)(119.9)363.6 
Gross profit as a % of revenue 5.8 %8.4 %6.4 %
Total assets
March 31, 2025$7,799.7 $2,664.9 $49.6 $1,245.8 
September 30, 2024$7,988.1 $2,734.5 $53.2 $1,208.7