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Reportable Segments and Geographic Information (Details) (USD $) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2014 item | Sep. 30, 2013 | Sep. 30, 2012
Summarized financial information concerning the Company's reportable segments |  |  |  |  |  |  |  |  |  |  |
Revenue | $ 2,562,500,000 | $ 1,968,200,000 | $ 1,872,200,000 | $ 1,953,900,000 | $ 2,079,100,000 | $ 2,067,500,000 | $ 1,989,600,000 | $ 2,017,300,000 | $ 8,356,783,000 | $ 8,153,495,000 | $ 8,218,180,000
Revenue, net of other direct costs |  |  |  |  |  |  |  |  | 4,855,600,000 | 4,977,000,000 | 5,183,900,000
Gross profit | 129,100,000 | 108,500,000 | 87,400,000 | 78,200,000 | 140,200,000 | 131,800,000 | 99,900,000 | 78,100,000 | 403,176,000 | 449,988,000 | 421,859,000
Equity in earnings of joint ventures | 8,400,000 | 6,000,000 | 7,400,000 | 36,100,000 | 6,400,000 | 4,100,000 | 7,900,000 | 5,900,000 | 57,924,000 | 24,319,000 | 48,650,000
General and administrative expenses | (15,500,000) | (15,100,000) | (26,400,000) | (23,900,000) | (23,900,000) | (24,000,000) | (27,300,000) | (22,100,000) | (80,908,000) | (97,318,000) | (80,903,000)
Acquisition and integration expense | 19,500,000 | 7,800,000 |  |  |  |  |  |  | (27,310,000) |  |
Goodwill impairment |  |  |  |  |  |  |  |  |  |  | (336,000,000)
Operating income (loss) | 102,500,000 | 91,600,000 | 68,400,000 | 90,400,000 | 122,700,000 | 111,900,000 | 80,500,000 | 61,900,000 | 352,882,000 | 376,989,000 | 53,606,000
Assets | 6,123,377,000 |  |  |  | 5,665,623,000 |  |  |  | 6,123,377,000 | 5,665,623,000 |
Gross profit as a % of revenue |  |  |  |  |  |  |  |  | 4.80% | 5.50% | 5.10%
Gross profit as a % of revenue, net of other direct costs |  |  |  |  |  |  |  |  | 8.30% | 9.00% | 8.10%
Number of reportable segments |  |  |  |  |  |  |  |  | 2 |  |
Corporate, Non-Segment [Member] |  |  |  |  |  |  |  |  |  |  |
Summarized financial information concerning the Company's reportable segments |  |  |  |  |  |  |  |  |  |  |
General and administrative expenses |  |  |  |  |  |  |  |  | (80,900,000) | (97,300,000) | (80,900,000)
Acquisition and integration expense |  |  |  |  |  |  |  |  | (27,300,000) |  |
Operating income (loss) |  |  |  |  |  |  |  |  | (108,200,000) | (97,300,000) | (80,900,000)
Intersegment Eliminations [Member] |  |  |  |  |  |  |  |  |  |  |
Summarized financial information concerning the Company's reportable segments |  |  |  |  |  |  |  |  |  |  |
Assets | 365,000,000 |  |  |  | 240,100,000 |  |  |  | 365,000,000 | 240,100,000 |
Professional Technical Services [Member] |  |  |  |  |  |  |  |  |  |  |
Summarized financial information concerning the Company's reportable segments |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 7,609,900,000 | 7,242,900,000 | 7,276,900,000
Revenue, net of other direct costs |  |  |  |  |  |  |  |  | 4,462,700,000 | 4,416,400,000 | 4,607,300,000
Gross profit |  |  |  |  |  |  |  |  | 365,200,000 | 416,900,000 | 423,800,000
Equity in earnings of joint ventures |  |  |  |  |  |  |  |  | 41,400,000 | 12,300,000 | 16,800,000
Goodwill impairment |  |  |  |  |  |  |  |  |  |  | (155,000,000)
Operating income (loss) |  |  |  |  |  |  |  |  |  |  | 285,600,000
Gross profit as a % of revenue |  |  |  |  |  |  |  |  | 4.80% | 5.80% | 5.80%
Gross profit as a % of revenue, net of other direct costs |  |  |  |  |  |  |  |  | 8.20% | 9.40% | 9.20%
Professional Technical Services [Member] | Operating Segments [Member] |  |  |  |  |  |  |  |  |  |  |
Summarized financial information concerning the Company's reportable segments |  |  |  |  |  |  |  |  |  |  |
Operating income (loss) |  |  |  |  |  |  |  |  | 406,600,000 | 429,200,000 |
Assets | 5,366,000,000 |  |  |  | 4,827,500,000 |  |  |  | 5,366,000,000 | 4,827,500,000 |
Management Support Services [Member] |  |  |  |  |  |  |  |  |  |  |
Summarized financial information concerning the Company's reportable segments |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 746,900,000 | 910,600,000 | 941,300,000
Revenue, net of other direct costs |  |  |  |  |  |  |  |  | 392,900,000 | 560,600,000 | 576,600,000
Gross profit |  |  |  |  |  |  |  |  | 38,000,000 | 33,100,000 | (1,900,000)
Equity in earnings of joint ventures |  |  |  |  |  |  |  |  | 16,500,000 | 12,000,000 | 31,800,000
Goodwill impairment |  |  |  |  |  |  |  |  |  |  | (181,000,000)
Operating income (loss) |  |  |  |  |  |  |  |  |  |  | (151,100,000)
Gross profit as a % of revenue |  |  |  |  |  |  |  |  | 5.10% | 3.60% | (0.20%)
Gross profit as a % of revenue, net of other direct costs |  |  |  |  |  |  |  |  | 9.70% | 5.90% | (0.30%)
Management Support Services [Member] | Operating Segments [Member] |  |  |  |  |  |  |  |  |  |  |
Summarized financial information concerning the Company's reportable segments |  |  |  |  |  |  |  |  |  |  |
Operating income (loss) |  |  |  |  |  |  |  |  | 54,500,000 | 45,100,000 |
Assets | $ 392,400,000 |  |  |  | $ 598,000,000 |  |  |  | $ 392,400,000 | $ 598,000,000 |

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