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Business Acquisitions, Goodwill and Intangible Assets (Details 3) (USD $) | 12 Months Ended |  |
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Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2012 item | Sep. 30, 2012 EMEA [Member] | Sep. 30, 2011 EMEA [Member] | Sep. 30, 2014 Unconsolidated Joint Ventures [Member] | Sep. 30, 2014 Professional Technical Services [Member] | Sep. 30, 2013 Professional Technical Services [Member] | Sep. 30, 2012 Professional Technical Services [Member] | Sep. 30, 2012 Management Support Services [Member] | Sep. 30, 2011 Management Support Services [Member] | Sep. 30, 2014 Management Support Services [Member] | Sep. 30, 2013 Management Support Services [Member]
Goodwill |  |  |  |  |  |  |  |  |  |  |  |  |
Market multiple of revenue |  |  |  | 0.35 | 0.50 |  |  |  |  | 0.35 | 0.50 |  |
Carrying value before impairment |  |  |  | $ 345,500,000 |  |  |  |  |  | $ 347,800,000 |  |  |
Goodwill impairment |  |  | (336,000,000) | (155,000,000) |  |  |  |  | (155,000,000) | (181,000,000) |  |  |
Carrying value after impairment |  |  |  | 190,500,000 |  |  |  |  |  | 166,800,000 |  |  |
Goodwill Impairment, net of tax |  |  | 317,200,000 |  |  |  |  |  |  |  |  |  |
Changes in the carrying value of goodwill by reporting segment |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill at the beginning of the period | 1,811,754,000 |  | 1,775,400,000 |  |  |  | 1,645,000,000 |  | 1,608,600,000 | 166,800,000 |  | 166,800,000 | 166,800,000
Post-Acquisition Adjustments | 5,000,000 |  |  |  |  |  | 5,000,000 |  |  |  |  |  |
Foreign Exchange Impact | (31,300,000) | (36,200,000) |  |  |  |  | (31,300,000) | (36,200,000) |  |  |  |  |
Acquired | 151,800,000 | 72,600,000 |  |  |  | 79,100,000 | 151,800,000 | 72,600,000 |  |  |  |  |
Goodwill impairment |  |  | (336,000,000) | (155,000,000) |  |  |  |  | (155,000,000) | (181,000,000) |  |  |
Goodwill at the end of the period | $ 1,937,338,000 | $ 1,811,754,000 |  |  |  |  | $ 1,770,500,000 | $ 1,645,000,000 |  |  | $ 166,800,000 | $ 166,800,000 | $ 166,800,000
Number of reporting units |  |  | 2 |  |  |  |  |  |  |  |  |  |

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