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Reportable Segments and Geographic Information (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2015 USD ($) | Jun. 30, 2015 USD ($) | Mar. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) | Sep. 30, 2014 USD ($) | Jun. 30, 2014 USD ($) | Mar. 31, 2014 USD ($) | Dec. 31, 2013 USD ($) | Sep. 30, 2015 USD ($) item | Sep. 30, 2014 USD ($) | Sep. 30, 2013 USD ($)
Summarized financial information concerning the Company's reportable segments |  |  |  |  |  |  |  |  |  |  |
Number of reportable segments | item |  |  |  |  |  |  |  |  | 3 |  |
Revenue | $ 4,723,700 | $ 4,549,500 | $ 4,506,200 | $ 4,210,500 | $ 2,562,500 | $ 1,968,200 | $ 1,872,200 | $ 1,953,900 | $ 17,989,880 | $ 8,356,783 | $ 8,153,495
Cost of revenue | 4,553,100 | 4,422,900 | 4,403,000 | 4,075,700 | 2,433,400 | 1,859,700 | 1,784,800 | 1,875,700 | 17,454,692 | 7,953,607 | 7,703,507
Gross profit | 170,600 | 126,600 | 103,200 | 134,800 | 129,100 | 108,500 | 87,400 | 78,200 | 535,188 | 403,176 | 449,988
Equity in earnings of joint ventures | 29,900 | 27,700 | 24,700 | 23,900 | 8,400 | 6,000 | 7,400 | 36,100 | 106,245 | 57,924 | 24,319
General and administrative expenses | (25,500) | (24,400) | (29,800) | (34,300) | (15,500) | (15,100) | (26,400) | (23,900) | (113,975) | (80,908) | (97,318)
Acquisition and integration expenses | (79,800) | (88,500) | (91,600) | (138,500) | (19,500) | (7,800) |  |  | 398,440 | 27,310 |
Operating income (loss) | 95,200 | $ 41,400 | $ 6,500 | $ (14,100) | 102,500 | $ 91,600 | $ 68,400 | $ 90,400 | 129,018 | 352,882 | 376,989
Segment assets | 14,014,298 |  |  |  | 6,123,377 |  |  |  | 14,014,298 | $ 6,123,377 |
Gross profit as a % of revenue |  |  |  |  |  |  |  |  |  | 4.80% |
Corporate |  |  |  |  |  |  |  |  |  |  |
Summarized financial information concerning the Company's reportable segments |  |  |  |  |  |  |  |  |  |  |
General and administrative expenses |  |  |  |  |  |  |  |  | (114,000) | $ (80,900) | (97,300)
Acquisition and integration expenses |  |  |  |  |  |  |  |  | (398,400) | (27,300) |
Operating income (loss) |  |  |  |  |  |  |  |  | (512,400) | (108,200) | (97,300)
Segment assets | 609,800 |  |  |  | 365,000 |  |  |  | 609,800 | 365,000 | 240,100
Design and Consulting Services |  |  |  |  |  |  |  |  |  |  |
Summarized financial information concerning the Company's reportable segments |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 7,962,900 | 5,443,100 | 5,556,100
Cost of revenue |  |  |  |  |  |  |  |  | 7,663,600 | 5,112,800 | 5,174,400
Gross profit |  |  |  |  |  |  |  |  | 299,300 | 330,300 | 381,700
Equity in earnings of joint ventures |  |  |  |  |  |  |  |  | 6,600 | 35,500 | 8,300
Operating income (loss) |  |  |  |  |  |  |  |  | 305,900 | 365,800 | 390,000
Segment assets | 7,118,200 |  |  |  | 4,064,500 |  |  |  | $ 7,118,200 | $ 4,064,500 | $ 1,945,900
Gross profit as a % of revenue |  |  |  |  |  |  |  |  | 3.80% | 6.10% | 6.90%
Construction Services |  |  |  |  |  |  |  |  |  |  |
Summarized financial information concerning the Company's reportable segments |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | $ 6,676,700 | $ 2,004,300 | $ 1,552,100
Cost of revenue |  |  |  |  |  |  |  |  | 6,633,900 | 1,975,000 | 1,527,900
Gross profit |  |  |  |  |  |  |  |  | 42,800 | 29,300 | 24,200
Equity in earnings of joint ventures |  |  |  |  |  |  |  |  | 23,000 | 6,000 | 4,000
Operating income (loss) |  |  |  |  |  |  |  |  | 65,800 | 35,300 | 28,200
Segment assets | 3,382,400 |  |  |  | 1,256,400 |  |  |  | $ 3,382,400 | $ 1,256,400 | $ 1,183,400
Gross profit as a % of revenue |  |  |  |  |  |  |  |  | 0.60% | 1.50% | 1.60%
Management Services |  |  |  |  |  |  |  |  |  |  |
Summarized financial information concerning the Company's reportable segments |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | $ 3,350,300 | $ 909,400 | $ 1,045,300
Cost of revenue |  |  |  |  |  |  |  |  | 3,157,200 | 865,800 | 1,001,200
Gross profit |  |  |  |  |  |  |  |  | 193,100 | 43,600 | 44,100
Equity in earnings of joint ventures |  |  |  |  |  |  |  |  | 76,600 | 16,300 | 12,000
Operating income (loss) |  |  |  |  |  |  |  |  | 269,700 | 60,000 | 56,100
Segment assets | $ 2,903,900 |  |  |  | $ 437,500 |  |  |  | $ 2,903,900 | $ 437,500 | $ 2,296,200
Gross profit as a % of revenue |  |  |  |  |  |  |  |  | 5.80% | 4.80% | 4.20%

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