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Reportable Segments and Geographic Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2018
Summarized financial information concerning the Company's reportable segments |  |  |  |  |  |  |  |  |  |  |
Revenue | $ 3,569,000 | $ 3,189,700 | $ 3,245,700 | $ 3,235,600 | $ 3,513,400 | $ 3,360,200 | $ 3,412,600 | $ 3,356,300 | $ 13,239,976 | $ 13,642,455 | $ 13,878,316
Gross profit | 189,900 | 185,100 | 168,800 | 165,800 | 189,700 | 153,800 | 144,800 | 123,400 | 709,560 | 611,655 | 479,033
Equity in earnings of joint ventures | 16,800 | 8,600 | 13,500 | 9,900 | 16,900 | 9,200 | 16,600 | 6,600 | 48,781 | 49,320 | 49,357
General and administrative expenses | (49,500) | (54,500) | (41,000) | (43,600) | (37,400) | (37,500) | (37,400) | (35,900) | (188,535) | (148,123) | (135,787)
Restructuring costs | (91,900) | (20,300) | (31,200) | (44,900) | 16,200 |  | 15,900 | 63,300 | (188,345) | (95,446) |
Gain on disposal activities |  |  |  |  | (3,600) |  |  |  |  | 3,590 |
Impairment of long-lived assets |  |  |  |  | (24,900) |  |  |  |  | (24,900) |
Operating income (loss) | 65,300 | $ 118,900 | $ 110,100 | $ 87,200 | 131,700 | $ 125,500 | $ 108,100 | $ 30,800 | 381,461 | 396,096 | 392,603
Segment assets | 12,998,951 |  |  |  | 14,550,908 |  |  |  | 12,998,951 | 14,550,908 |
Total |  |  |  |  |  |  |  |  |  |  |
Summarized financial information concerning the Company's reportable segments |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 13,240,000 | 13,642,500 | 13,878,300
Gross profit |  |  |  |  |  |  |  |  | 709,600 | 611,700 | 479,000
Equity in earnings of joint ventures |  |  |  |  |  |  |  |  | 48,800 | 49,300 | 49,400
General and administrative expenses |  |  |  |  |  |  |  |  | (188,600) | (148,200) | (135,800)
Restructuring costs |  |  |  |  |  |  |  |  | (188,300) | (95,400) |
Gain on disposal activities |  |  |  |  |  |  |  |  |  | 3,600 |
Impairment of long-lived assets |  |  |  |  |  |  |  |  |  | (24,900) |
Operating income (loss) |  |  |  |  |  |  |  |  | $ 381,500 | $ 396,100 | $ 392,600
Gross profit as a % of revenue |  |  |  |  |  |  |  |  | 5.40% | 4.50% | 3.50%
Corporate |  |  |  |  |  |  |  |  |  |  |
Summarized financial information concerning the Company's reportable segments |  |  |  |  |  |  |  |  |  |  |
General and administrative expenses |  |  |  |  |  |  |  |  | $ (180,000) | $ (143,200) | $ (124,600)
Restructuring costs |  |  |  |  |  |  |  |  | (188,300) | (95,400) |
Impairment of long-lived assets |  |  |  |  |  |  |  |  |  | (9,700) |
Operating income (loss) |  |  |  |  |  |  |  |  | (368,300) | (248,300) | (124,600)
Segment assets | 1,573,900 |  |  |  | 718,400 |  |  |  | 1,573,900 | 718,400 | 676,900
Americas |  |  |  |  |  |  |  |  |  |  |
Summarized financial information concerning the Company's reportable segments |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 10,131,500 | 10,382,600 | 10,512,300
Gross profit |  |  |  |  |  |  |  |  | 580,500 | 511,500 | 403,800
Equity in earnings of joint ventures |  |  |  |  |  |  |  |  | 19,800 | 17,700 | 27,100
Impairment of long-lived assets |  |  |  |  |  |  |  |  |  | (10,800) |
Operating income (loss) |  |  |  |  |  |  |  |  | 600,300 | 518,400 | 430,900
Segment assets | 7,929,300 |  |  |  | 7,437,300 |  |  |  | $ 7,929,300 | $ 7,437,300 | $ 7,119,900
Gross profit as a % of revenue |  |  |  |  |  |  |  |  | 5.70% | 4.90% | 3.80%
International |  |  |  |  |  |  |  |  |  |  |
Summarized financial information concerning the Company's reportable segments |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | $ 3,101,700 | $ 3,251,700 | $ 3,366,000
Gross profit |  |  |  |  |  |  |  |  | 122,200 | 91,900 | 75,200
Equity in earnings of joint ventures |  |  |  |  |  |  |  |  | 14,300 | 13,900 | 7,000
Gain on disposal activities |  |  |  |  |  |  |  |  |  | 3,600 |
Impairment of long-lived assets |  |  |  |  |  |  |  |  |  | (4,400) |
Operating income (loss) |  |  |  |  |  |  |  |  | 136,500 | 105,000 | 82,200
Segment assets | 2,454,000 |  |  |  | 2,247,100 |  |  |  | $ 2,454,000 | $ 2,247,100 | $ 2,353,200
Gross profit as a % of revenue |  |  |  |  |  |  |  |  | 3.90% | 2.80% | 2.20%
AECOM Capital |  |  |  |  |  |  |  |  |  |  |
Summarized financial information concerning the Company's reportable segments |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | $ 6,800 | $ 8,200 |
Gross profit |  |  |  |  |  |  |  |  | 6,900 | 8,300 |
Equity in earnings of joint ventures |  |  |  |  |  |  |  |  | 14,700 | 17,700 | $ 15,300
General and administrative expenses |  |  |  |  |  |  |  |  | (8,600) | (5,000) | (11,200)
Operating income (loss) |  |  |  |  |  |  |  |  | 13,000 | 21,000 | 4,100
Segment assets | $ 198,000 |  |  |  | $ 197,800 |  |  |  | $ 198,000 | $ 197,800 | $ 140,600

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