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Reportable Segments and Geographic Information - Segments (Details) $ in Thousands | 3 Months Ended |
--- | --- | ---
Dec. 31, 2016 USD ($) segment | Dec. 31, 2015 USD ($) | Sep. 30, 2016 USD ($)
Summarized financial information concerning the Company's reportable segments |  |  |
Number of reportable segments | segment | 3 |  |
Cost of revenue | $ 4,188,376 | $ 4,156,793 |
Revenue | 4,358,349 | 4,297,651 |
Gross profit | 169,973 | 140,858 |
Equity in earnings of joint ventures | 21,471 | 25,263 |
General and administrative expenses | (32,639) | (28,639) |
Acquisition and integration expenses | (15,412) | (41,038) |
Loss on disposal activities |  | (41,053) |
Operating income (loss) | 143,393 | $ 55,391 |
Segment assets | $ 13,508,996 |  | $ 13,669,936
Gross profit as a % of revenue | 3.90% | 3.30% |
Corporate |  |  |
Summarized financial information concerning the Company's reportable segments |  |  |
General and administrative expenses | $ (32,600) | $ (28,700) |
Acquisition and integration expenses | (15,400) | (41,000) |
Operating income (loss) | (48,000) | (69,700) |
Segment assets | 714,900 |  | 765,300
Design and Consulting Services |  |  |
Summarized financial information concerning the Company's reportable segments |  |  |
Revenue | 1,840,800 | 1,862,100 |
Gross profit | 95,200 | 79,300 |
Equity in earnings of joint ventures | 4,100 | 3,000 |
Operating income (loss) | 99,300 | $ 82,300 |
Segment assets | $ 6,646,100 |  | 6,655,700
Gross profit as a % of revenue | 5.20% | 4.30% |
Construction Services |  |  |
Summarized financial information concerning the Company's reportable segments |  |  |
Revenue | $ 1,750,200 | $ 1,678,600 |
Gross profit | 13,800 | 11,400 |
Equity in earnings of joint ventures | 4,300 | 2,600 |
Loss on disposal activities |  | (41,000) |
Operating income (loss) | 18,100 | $ (27,000) |
Segment assets | $ 3,516,100 |  | 3,556,200
Gross profit as a % of revenue | 0.80% | 0.70% |
Management Services |  |  |
Summarized financial information concerning the Company's reportable segments |  |  |
Revenue | $ 767,300 | $ 757,000 |
Gross profit | 61,000 | 50,200 |
Equity in earnings of joint ventures | 13,000 | 19,600 |
Operating income (loss) | 74,000 | $ 69,800 |
Segment assets | $ 2,631,900 |  | $ 2,692,700
Gross profit as a % of revenue | 7.90% | 6.60% |
Management Services | Restatement Adjustment |  |  |
Summarized financial information concerning the Company's reportable segments |  |  |
Cost of revenue |  | $ 32,000 |
Revenue |  | $ 33,000 |

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