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Reportable Segments and Geographic Information (Details) (USD $) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2011 | Sep. 30, 2013 item | Sep. 30, 2012 | Sep. 30, 2011
Reportable Segments and Geographic Information |  |  |  |  |  |  |  |  |  |  |
Number of reportable segments |  |  |  |  |  |  |  |  | 2 |  |
Summarized financial information concerning the Company's reportable segments |  |  |  |  |  |  |  |  |  |  |
Revenue | $ 2,079,100,000 | $ 2,067,500,000 | $ 1,989,600,000 | $ 2,017,300,000 | $ 2,082,900,000 | $ 2,095,200,000 | $ 2,010,900,000 | $ 2,029,200,000 | $ 8,153,495,000 | $ 8,218,180,000 | $ 8,037,374,000
Revenue, net of other direct costs |  |  |  |  |  |  |  |  | 4,977,000,000 | 5,183,900,000 | 5,180,800,000
Gross profit | 140,200,000 | 131,800,000 | 99,900,000 | 78,100,000 | 144,200,000 | 111,200,000 | 76,200,000 | 90,300,000 | 449,988,000 | 421,859,000 | 466,702,000
Equity in earnings of joint ventures | 6,400,000 | 4,100,000 | 7,900,000 | 5,900,000 | 10,400,000 | 12,300,000 | 16,900,000 | 9,000,000 | 24,319,000 | 48,650,000 | 44,819,000
General and administrative expenses | (23,900,000) | (24,000,000) | (27,300,000) | (22,100,000) | (17,700,000) | (20,700,000) | (19,900,000) | (22,600,000) | (97,318,000) | (80,903,000) | (90,298,000)
Goodwill impairment |  |  |  |  | (336,000,000) |  |  |  |  | (336,000,000) |
Operating income (loss) | 122,700,000 | 111,900,000 | 80,500,000 | 61,900,000 | (199,100,000) | 102,800,000 | 73,200,000 | 76,700,000 | 376,989,000 | 53,606,000 | 421,223,000
Segment assets | 5,665,623,000 |  |  |  | 5,664,568,000 |  |  |  | 5,665,623,000 | 5,664,568,000 | 5,789,300,000
Gross profit as a % of revenue |  |  |  |  |  |  |  |  | 5.50% | 5.10% | 5.80%
Gross profit as a % of revenue, net of other direct costs |  |  |  |  |  |  |  |  | 9.00% | 8.10% | 9.00%
Professional Technical Services |  |  |  |  |  |  |  |  |  |  |
Summarized financial information concerning the Company's reportable segments |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 7,242,900,000 | 7,276,900,000 | 6,877,100,000
Revenue, net of other direct costs |  |  |  |  |  |  |  |  | 4,416,400,000 | 4,607,300,000 | 4,612,200,000
Gross profit |  |  |  |  |  |  |  |  | 416,900,000 | 423,800,000 | 417,700,000
Equity in earnings of joint ventures |  |  |  |  |  |  |  |  | 12,300,000 | 16,800,000 | 15,300,000
Goodwill impairment |  |  |  |  |  |  |  |  |  | (155,000,000) |
Operating income (loss) |  |  |  |  |  |  |  |  | 429,200,000 | 285,600,000 | 433,000,000
Segment assets | 5,761,100,000 |  |  |  | 5,557,200,000 |  |  |  | 5,761,100,000 | 5,557,200,000 | 5,296,700,000
Gross profit as a % of revenue |  |  |  |  |  |  |  |  | 5.80% | 5.80% | 6.10%
Gross profit as a % of revenue, net of other direct costs |  |  |  |  |  |  |  |  | 9.40% | 9.20% | 9.10%
Management Support Services |  |  |  |  |  |  |  |  |  |  |
Summarized financial information concerning the Company's reportable segments |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 910,600,000 | 941,300,000 | 1,160,300,000
Revenue, net of other direct costs |  |  |  |  |  |  |  |  | 560,600,000 | 576,600,000 | 568,600,000
Gross profit |  |  |  |  |  |  |  |  | 33,100,000 | (1,900,000) | 49,000,000
Equity in earnings of joint ventures |  |  |  |  |  |  |  |  | 12,000,000 | 31,800,000 | 29,500,000
Goodwill impairment |  |  |  |  |  |  |  |  |  | (181,000,000) |
Operating income (loss) |  |  |  |  |  |  |  |  | 45,100,000 | (151,100,000) | 78,500,000
Segment assets | 541,900,000 |  |  |  | 564,800,000 |  |  |  | 541,900,000 | 564,800,000 | 740,400,000
Gross profit as a % of revenue |  |  |  |  |  |  |  |  | 3.60% | (0.20%) | 4.20%
Gross profit as a % of revenue, net of other direct costs |  |  |  |  |  |  |  |  | 5.90% | (0.30%) | 8.60%
Corporate |  |  |  |  |  |  |  |  |  |  |
Summarized financial information concerning the Company's reportable segments |  |  |  |  |  |  |  |  |  |  |
General and administrative expenses |  |  |  |  |  |  |  |  | (97,300,000) | (80,900,000) | (90,300,000)
Operating income (loss) |  |  |  |  |  |  |  |  | (97,300,000) | (80,900,000) | (90,300,000)
Segment assets | $ (637,400,000) |  |  |  | $ (457,400,000) |  |  |  | $ (637,400,000) | $ (457,400,000) | $ (247,800,000)

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