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Business Acquisitions, Goodwill, and Intangible Assets (Details 3) (USD $) | 3 Months Ended | 12 Months Ended |  | 12 Months Ended
--- | --- | --- | --- | ---
Sep. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2012 item | Sep. 30, 2013 Professional Technical Services | Sep. 30, 2012 Professional Technical Services | Dec. 31, 2012 Management Support Services | Sep. 30, 2012 Management Support Services | Dec. 31, 2011 Management Support Services | Sep. 30, 2013 Management Support Services | Dec. 31, 2012 EMEA | Dec. 31, 2011 EMEA
Business Acquisitions, Goodwill, and Intangible Assets |  |  |  |  |  |  |  |  |  |  |
Number of reporting units |  |  | 2 |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  |  |  |  |  |
Market multiple of revenue |  |  |  |  |  | 0.35 |  | 0.5 |  | 0.35 | 0.5
Carrying value before impairment |  |  |  |  |  |  | $ 347,800,000 |  |  | $ 345,500,000 |
Goodwill impairment | (336,000,000) |  | (336,000,000) |  | (155,000,000) |  | (181,000,000) |  |  | (155,000,000) |
Carrying value after impairment |  |  |  |  |  |  | 166,800,000 |  |  | 190,500,000 |
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 |  | 1,775,352,000 | 2,086,300,000 | 1,608,600,000 | 1,733,900,000 |  | 352,400,000 |  | 166,800,000 |  |
Post-Acquisition Adjustments |  |  | (5,800,000) |  | (1,200,000) |  | (4,600,000) |  |  |  |
Foreign Exchange Impact |  | (36,200,000) | 20,400,000 | (36,200,000) | 20,400,000 |  |  |  |  |  |
Acquired |  | 72,600,000 | 10,500,000 | 72,600,000 | 10,500,000 |  |  |  |  |  |
Goodwill impairment | (336,000,000) |  | (336,000,000) |  | (155,000,000) |  | (181,000,000) |  |  | (155,000,000) |
Goodwill at the end of the period | $ 1,775,352,000 | $ 1,811,754,000 | $ 1,775,352,000 | $ 1,645,000,000 | $ 1,608,600,000 |  | $ 166,800,000 |  | $ 166,800,000 |  |

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- Definition Carrying amount as of the balance sheet date, which is the cumulative amount paid and (if applicable) the fair value of any noncontrolling interest in the acquiree, adjusted for any amortization recognized prior to the adoption of any changes in generally accepted accounting principles (as applicable) and for any impairment charges, in excess of the fair value of net assets acquired in one or more business combination transactions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141R -Paragraph 68 -Subparagraph l -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13816-109267 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 142 -Paragraph 45 -Subparagraph e -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 142 -Paragraph 43 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141R -Paragraph 72 -Subparagraph d -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 142 -Paragraph 45 -Subparagraph e -Clause 1 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141R -Paragraph 34 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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