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Reportable Segments and Geographic Information (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2014 USD ($) | Jun. 30, 2014 USD ($) | Mar. 31, 2014 USD ($) | Dec. 31, 2013 USD ($) | Sep. 30, 2013 USD ($) | Jun. 30, 2013 USD ($) | Mar. 31, 2013 USD ($) | Dec. 31, 2012 USD ($) | Sep. 30, 2014 USD ($) item | Sep. 30, 2013 USD ($) | Sep. 30, 2012 USD ($)
Summarized financial information concerning the Company's reportable segments |  |  |  |  |  |  |  |  |  |  |
Number of reportable segments | item |  |  |  |  |  |  |  |  | 2 |  |
Revenue | $ 2,562,500 | $ 1,968,200 | $ 1,872,200 | $ 1,953,900 | $ 2,079,100 | $ 2,067,500 | $ 1,989,600 | $ 2,017,300 | $ 8,356,783 | $ 8,153,495 | $ 8,218,180
Cost of revenue. | 2,433,400 | 1,859,700 | 1,784,800 | 1,875,700 | 1,938,900 | 1,935,700 | 1,889,700 | 1,939,200 | 7,953,607 | 7,703,507 | 7,796,321
Gross profit | 129,100 | 108,500 | 87,400 | 78,200 | 140,200 | 131,800 | 99,900 | 78,100 | 403,176 | 449,988 | 421,859
Equity in (losses) earnings of joint ventures | 8,400 | 6,000 | 7,400 | 36,100 | 6,400 | 4,100 | 7,900 | 5,900 | 57,924 | 24,319 | 48,650
General and administrative expenses | (15,500) | (15,100) | (26,400) | (23,900) | (23,900) | (24,000) | (27,300) | (22,100) | (80,908) | (97,318) | (80,903)
Acquisition and integration expenses | (19,500) | (7,800) |  |  |  |  |  |  | (27,310) |  |
Goodwill impairment |  |  |  |  |  |  |  |  |  |  | (336,000)
Operating income | 102,500 | $ 91,600 | $ 68,400 | $ 90,400 | 122,700 | $ 111,900 | $ 80,500 | $ 61,900 | $ 352,882 | $ 376,989 | $ 53,606
Gross profit as a % of revenue |  |  |  |  |  |  |  |  | 4.80% | 5.50% | 5.10%
Total Assets | 6,123,377 |  |  |  | 5,665,623 |  |  |  | $ 6,123,377 | $ 5,665,623 |
Corporate |  |  |  |  |  |  |  |  |  |  |
Summarized financial information concerning the Company's reportable segments |  |  |  |  |  |  |  |  |  |  |
General and administrative expenses |  |  |  |  |  |  |  |  | (80,900) | (97,300) | $ (80,900)
Acquisition and integration expenses |  |  |  |  |  |  |  |  | (27,300) |  |
Operating income |  |  |  |  |  |  |  |  | (108,200) | (97,300) | (80,900)
Total Assets | 365,000 |  |  |  | 240,100 |  |  |  | 365,000 | 240,100 |
Parent |  |  |  |  |  |  |  |  |  |  |
Summarized financial information concerning the Company's reportable segments |  |  |  |  |  |  |  |  |  |  |
General and administrative expenses |  |  |  |  |  |  |  |  | (80,900) | (97,300) | (80,900)
Acquisition and integration expenses |  |  |  |  |  |  |  |  | (27,300) |  |
Operating income |  |  |  |  |  |  |  |  | 238,500 | 237,000 | (38,500)
Total Assets | 3,565,500 |  |  |  | 3,602,000 |  |  |  | 3,565,500 | 3,602,000 |
Design and Consulting Services |  |  |  |  |  |  |  |  |  |  |
Summarized financial information concerning the Company's reportable segments |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 5,443,100 | 5,556,100 | 5,773,600
Cost of revenue. |  |  |  |  |  |  |  |  | 5,112,800 | 5,174,400 | 5,374,800
Gross profit |  |  |  |  |  |  |  |  | 330,300 | 381,700 | 398,800
Equity in (losses) earnings of joint ventures |  |  |  |  |  |  |  |  | 35,500 | 8,300 | 10,900
Goodwill impairment |  |  |  |  |  |  |  |  |  |  | (155,000)
Operating income |  |  |  |  |  |  |  |  | $ 365,800 | $ 390,000 | $ 254,700
Gross profit as a % of revenue |  |  |  |  |  |  |  |  | 6.10% | 6.90% | 6.90%
Total Assets | 4,064,500 |  |  |  | 1,945,900 |  |  |  | $ 4,064,500 | $ 1,945,900 |
Construction Services |  |  |  |  |  |  |  |  |  |  |
Summarized financial information concerning the Company's reportable segments |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 2,004,300 | 1,552,100 | $ 1,391,600
Cost of revenue. |  |  |  |  |  |  |  |  | 1,975,000 | 1,527,900 | 1,370,200
Gross profit |  |  |  |  |  |  |  |  | 29,300 | 24,200 | 21,400
Equity in (losses) earnings of joint ventures |  |  |  |  |  |  |  |  | 6,000 | 4,000 | 5,800
Operating income |  |  |  |  |  |  |  |  | $ 35,300 | $ 28,200 | $ 27,200
Gross profit as a % of revenue |  |  |  |  |  |  |  |  | 1.50% | 1.60% | 1.50%
Total Assets | 1,256,400 |  |  |  | 1,183,400 |  |  |  | $ 1,256,400 | $ 1,183,400 |
Management Services |  |  |  |  |  |  |  |  |  |  |
Summarized financial information concerning the Company's reportable segments |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 909,400 | 1,045,300 | $ 1,053,000
Cost of revenue. |  |  |  |  |  |  |  |  | 865,800 | 1,001,200 | 1,051,300
Gross profit |  |  |  |  |  |  |  |  | 43,600 | 44,100 | 1,700
Equity in (losses) earnings of joint ventures |  |  |  |  |  |  |  |  | 16,400 | 12,000 | 31,900
Goodwill impairment |  |  |  |  |  |  |  |  |  |  | (181,000)
Operating income |  |  |  |  |  |  |  |  | $ 60,000 | $ 56,100 | $ (147,400)
Gross profit as a % of revenue |  |  |  |  |  |  |  |  | 4.80% | 4.20% | 0.20%
Total Assets | $ 437,500 |  |  |  | $ 2,296,200 |  |  |  | $ 437,500 | $ 2,296,200 |

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