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Reportable Segments (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2018 USD ($) | Jun. 30, 2018 USD ($) | Mar. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Sep. 30, 2017 USD ($) | Jun. 30, 2017 USD ($) | Mar. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Sep. 30, 2018 USD ($) segment | Sep. 30, 2017 USD ($) | Sep. 30, 2016 USD ($)
Summarized financial information concerning the Company's reportable segments |  |  |  |  |  |  |  |  |  |  |
Number of reportable segments | segment |  |  |  |  |  |  |  |  | 4 |  |
Cost of revenue. | $ 5,117,800 | $ 4,962,800 | $ 4,649,700 | $ 4,774,600 | $ 4,686,300 | $ 4,386,300 | $ 4,258,800 | $ 4,188,300 | $ 19,504,863 | $ 17,519,682 | $ 16,768,001
Revenue | 5,305,800 | 5,148,000 | 4,790,900 | 4,910,800 | 4,856,400 | 4,561,500 | 4,427,200 | 4,358,300 | 20,155,512 | 18,203,402 | 17,410,825
Gross profit | 188,000 | 185,200 | 141,200 | 136,200 | 170,100 | 175,200 | 168,400 | 170,000 | 650,649 | 683,720 | 642,824
Equity in earnings of joint ventures | 25,500 | 12,800 | 13,100 | 29,700 | 31,900 | 66,500 | 21,800 | 21,400 | 81,133 | 141,582 | 104,032
General and administrative expenses | (35,700) | (35,100) | (30,200) | (34,700) | (36,900) | (34,000) | (29,900) | (32,600) | (135,787) | (133,309) | (115,088)
Impairment on assets held for sale, including goodwill |  |  | (168,200) |  |  |  |  |  | (168,178) |  |
Acquisition and integration expenses |  |  |  |  | (3,300) |  | (20,000) | (15,400) |  | (38,709) | (213,642)
(Loss) gain on disposal activities | (800) | (2,100) |  |  |  |  | 600 |  | (2,949) | 572 | (42,589)
Operating income (loss) | 177,000 | $ 160,800 | $ (44,100) | $ 131,200 | 161,800 | $ 207,700 | $ 140,900 | $ 143,400 | 424,868 | 653,856 | 375,537
Total assets | 14,681,131 |  |  |  | 14,396,956 |  |  |  | $ 14,681,131 | $ 14,396,956 | $ 13,669,900
Gross profit as a % of revenue |  |  |  |  |  |  |  |  | 3.20% | 3.80% | 3.70%
Corporate |  |  |  |  |  |  |  |  |  |  |
Summarized financial information concerning the Company's reportable segments |  |  |  |  |  |  |  |  |  |  |
General and administrative expenses |  |  |  |  |  |  |  |  | $ (124,500) | $ (124,700) | $ (109,100)
Acquisition and integration expenses |  |  |  |  |  |  |  |  |  | (38,700) | (213,600)
Operating income (loss) |  |  |  |  |  |  |  |  | (124,500) | (163,400) | (322,700)
Total assets | 613,500 |  |  |  | 386,200 |  |  |  | 613,500 | 386,200 | 586,200
Design and Consulting Services |  |  |  |  |  |  |  |  |  |  |
Summarized financial information concerning the Company's reportable segments |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 8,223,100 | 7,566,800 | 7,655,800
Gross profit |  |  |  |  |  |  |  |  | 439,200 | 394,800 | 382,500
Equity in earnings of joint ventures |  |  |  |  |  |  |  |  | 15,800 | 16,400 | 8,900
(Loss) gain on disposal activities |  |  |  |  |  |  |  |  |  | 600 |
Operating income (loss) |  |  |  |  |  |  |  |  | 455,000 | 411,800 | 391,400
Total assets | 7,013,800 |  |  |  | 6,992,600 |  |  |  | $ 7,013,800 | $ 6,992,600 | $ 6,655,700
Gross profit as a % of revenue |  |  |  |  |  |  |  |  | 5.30% | 5.20% | 5.00%
Construction Services |  |  |  |  |  |  |  |  |  |  |
Summarized financial information concerning the Company's reportable segments |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | $ 8,238,900 | $ 7,295,600 | $ 6,371,100
Gross profit |  |  |  |  |  |  |  |  | 40,400 | 92,900 | 25,400
Equity in earnings of joint ventures |  |  |  |  |  |  |  |  | 21,500 | 22,400 | 18,200
Impairment on assets held for sale, including goodwill |  |  |  |  |  |  |  |  | (168,200) |  |
(Loss) gain on disposal activities |  |  |  |  |  |  |  |  | (2,900) |  | (42,600)
Operating income (loss) |  |  |  |  |  |  |  |  | (109,200) | 115,300 | 1,000
Total assets | 4,212,000 |  |  |  | 4,114,500 |  |  |  | $ 4,212,000 | $ 4,114,500 | $ 3,556,200
Gross profit as a % of revenue |  |  |  |  |  |  |  |  | 0.50% | 1.30% | 0.40%
Management Services |  |  |  |  |  |  |  |  |  |  |
Summarized financial information concerning the Company's reportable segments |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | $ 3,693,500 | $ 3,341,000 | $ 3,383,900
Gross profit |  |  |  |  |  |  |  |  | 171,000 | 196,000 | 234,900
Equity in earnings of joint ventures |  |  |  |  |  |  |  |  | 28,600 | 45,100 | 76,900
Operating income (loss) |  |  |  |  |  |  |  |  | 199,600 | 241,100 | 311,800
Total assets | 2,701,200 |  |  |  | 2,704,600 |  |  |  | $ 2,701,200 | $ 2,704,600 | $ 2,692,700
Gross profit as a % of revenue |  |  |  |  |  |  |  |  | 4.60% | 5.90% | 6.90%
Management Services | Restatement Adjustment |  |  |  |  |  |  |  |  |  |  |
Summarized financial information concerning the Company's reportable segments |  |  |  |  |  |  |  |  |  |  |
Cost of revenue. |  |  |  |  |  |  |  |  |  | $ 124,000 |
Revenue |  |  |  |  |  |  |  |  |  | 130,000 |
AECOM Capital |  |  |  |  |  |  |  |  |  |  |
Summarized financial information concerning the Company's reportable segments |  |  |  |  |  |  |  |  |  |  |
Equity in earnings of joint ventures |  |  |  |  |  |  |  |  | $ 15,200 | 57,700 |
General and administrative expenses |  |  |  |  |  |  |  |  | (11,200) | (8,700) | $ (6,000)
Operating income (loss) |  |  |  |  |  |  |  |  | 4,000 | 49,000 | (6,000)
Total assets | $ 140,600 |  |  |  | $ 199,100 |  |  |  | $ 140,600 | $ 199,100 | $ 179,100

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