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Reportable Segments and Geographic Information (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2019 USD ($) | Jun. 30, 2019 USD ($) | Mar. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Sep. 30, 2018 USD ($) | Jun. 30, 2018 USD ($) | Mar. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Sep. 30, 2019 USD ($) segment | Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($)
Summarized financial information concerning the Company's reportable segments |  |  |  |  |  |  |  |  |  |  |
Number of reportable segments | segment |  |  |  |  |  |  |  |  | 4 |  |
Revenue | $ 5,115,600 | $ 4,980,200 | $ 5,040,000 | $ 5,037,500 | $ 5,305,800 | $ 5,148,000 | $ 4,790,900 | $ 4,910,800 | $ 20,173,329 | $ 20,155,512 | $ 18,203,402
Gross profit (loss) | 238,200 | 209,200 | 195,400 | 170,600 | 188,000 | 185,200 | 141,200 | 136,200 | 813,445 | 650,649 | 683,720
Equity in earnings of joint ventures | 14,000 | 28,600 | 25,900 | 12,500 | 25,500 | 12,800 | 13,100 | 29,700 | 80,990 | 81,133 | 141,582
General and administrative expenses | (37,300) | (37,500) | (37,400) | (35,900) | (35,700) | (35,100) | (30,200) | (34,700) | (148,123) | (135,787) | (133,309)
Restructuring costs | 16,200 |  | 15,900 | 63,300 |  |  |  |  | (95,446) |  |
Gain (loss) on disposal activities | (3,000) | (7,400) |  |  | (800) | (2,100) |  |  | (10,381) | (2,949) | 572
Impairment on of long-lived assets/assets held for sale, including goodwill | (615,400) |  | (168,200) |  |  |  | (168,200) |  | (615,400) | (168,178) |
Acquisition and integration expenses |  |  |  |  |  |  |  |  |  |  | (38,709)
Operating income (loss) | (419,700) | $ 192,900 | $ 168,000 | $ 83,900 | 177,000 | $ 160,800 | $ (44,100) | $ 131,200 | 25,085 | 424,868 | 653,856
Segment assets | 14,461,591 |  |  |  | 14,681,131 |  |  |  | 14,461,591 | 14,681,131 |
Total |  |  |  |  |  |  |  |  |  |  |
Summarized financial information concerning the Company's reportable segments |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 20,173,300 | 20,155,500 | 18,203,400
Gross profit (loss) |  |  |  |  |  |  |  |  | 813,400 | 650,600 | 683,700
Equity in earnings of joint ventures |  |  |  |  |  |  |  |  | 81,000 | 81,100 | 141,600
General and administrative expenses |  |  |  |  |  |  |  |  | (148,100) | (135,700) | (133,400)
Restructuring costs |  |  |  |  |  |  |  |  | (95,400) |  |
Gain (loss) on disposal activities |  |  |  |  |  |  |  |  | (10,400) | (2,900) | 600
Impairment on of long-lived assets/assets held for sale, including goodwill |  |  |  |  |  |  |  |  | (615,400) | (168,200) |
Acquisition and integration expenses |  |  |  |  |  |  |  |  |  |  | (38,700)
Operating income (loss) |  |  |  |  |  |  |  |  | 25,100 | 424,900 | 653,800
Segment assets | 14,461,600 |  |  |  | 14,681,100 |  |  |  | $ 14,461,600 | $ 14,681,100 | $ 14,397,000
Gross profit (loss) as a % of revenue |  |  |  |  |  |  |  |  | 4.00% | 3.20% | 3.80%
Corporate |  |  |  |  |  |  |  |  |  |  |
Summarized financial information concerning the Company's reportable segments |  |  |  |  |  |  |  |  |  |  |
General and administrative expenses |  |  |  |  |  |  |  |  | $ (143,200) | $ (124,500) | $ (124,700)
Restructuring costs |  |  |  |  |  |  |  |  | (95,400) |  |
Impairment on of long-lived assets/assets held for sale, including goodwill |  |  |  |  |  |  |  |  | (9,700) |  |
Acquisition and integration expenses |  |  |  |  |  |  |  |  |  |  | (38,700)
Operating income (loss) |  |  |  |  |  |  |  |  | (248,300) | (124,500) | (163,400)
Segment assets | 674,800 |  |  |  | 613,500 |  |  |  | 674,800 | 613,500 | 386,200
Design and Consulting Services |  |  |  |  |  |  |  |  |  |  |
Summarized financial information concerning the Company's reportable segments |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 8,268,200 | 8,223,100 | 7,566,800
Gross profit (loss) |  |  |  |  |  |  |  |  | 545,900 | 439,200 | 394,800
Equity in earnings of joint ventures |  |  |  |  |  |  |  |  | 18,000 | 15,800 | 16,400
Gain (loss) on disposal activities |  |  |  |  |  |  |  |  | 3,600 |  | 600
Impairment on of long-lived assets/assets held for sale, including goodwill |  |  |  |  |  |  |  |  | (15,200) |  |
Operating income (loss) |  |  |  |  |  |  |  |  | 552,300 | 455,000 | 411,800
Segment assets | 7,136,300 |  |  |  | 7,013,800 |  |  |  | $ 7,136,300 | $ 7,013,800 | $ 6,992,600
Gross profit (loss) as a % of revenue |  |  |  |  |  |  |  |  | 6.60% | 5.30% | 5.20%
Construction Services |  |  |  |  |  |  |  |  |  |  |
Summarized financial information concerning the Company's reportable segments |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | $ 7,778,800 | $ 8,238,900 | $ 7,295,600
Gross profit (loss) |  |  |  |  |  |  |  |  | 55,400 | 40,400 | 92,900
Equity in earnings of joint ventures |  |  |  |  |  |  |  |  | 36,500 | 21,500 | 22,400
Gain (loss) on disposal activities |  |  |  |  |  |  |  |  | (7,400) | (2,900) |
Impairment on of long-lived assets/assets held for sale, including goodwill |  |  |  |  |  |  |  |  | (590,500) | (168,200) |
Operating income (loss) |  |  |  |  |  |  |  |  | (506,000) | (109,200) | 115,300
Segment assets | 3,804,000 |  |  |  | 4,212,000 |  |  |  | $ 3,804,000 | $ 4,212,000 | $ 4,114,500
Gross profit (loss) as a % of revenue |  |  |  |  |  |  |  |  | 0.70% | 0.50% | 1.30%
Management Services |  |  |  |  |  |  |  |  |  |  |
Summarized financial information concerning the Company's reportable segments |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | $ 4,118,100 | $ 3,693,500 | $ 3,341,000
Gross profit (loss) |  |  |  |  |  |  |  |  | 203,900 | 171,000 | 196,000
Equity in earnings of joint ventures |  |  |  |  |  |  |  |  | 8,800 | 28,600 | 45,100
Gain (loss) on disposal activities |  |  |  |  |  |  |  |  | (6,600) |  |
Operating income (loss) |  |  |  |  |  |  |  |  | 206,100 | 199,600 | 241,100
Segment assets | 2,648,700 |  |  |  | 2,701,200 |  |  |  | $ 2,648,700 | $ 2,701,200 | $ 2,704,600
Gross profit (loss) as a % of revenue |  |  |  |  |  |  |  |  | 5.00% | 4.60% | 5.90%
AECOM Capital |  |  |  |  |  |  |  |  |  |  |
Summarized financial information concerning the Company's reportable segments |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | $ 8,200 |  |
Gross profit (loss) |  |  |  |  |  |  |  |  | 8,200 |  |
Equity in earnings of joint ventures |  |  |  |  |  |  |  |  | 17,700 | $ 15,200 | $ 57,700
General and administrative expenses |  |  |  |  |  |  |  |  | (4,900) | (11,200) | (8,700)
Operating income (loss) |  |  |  |  |  |  |  |  | 21,000 | 4,000 | 49,000
Segment assets | $ 197,800 |  |  |  | $ 140,600 |  |  |  | $ 197,800 | $ 140,600 | $ 199,100

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