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Business Acquisitions, Goodwill and Intangible Assets (Details) (USD $) | 6 Months Ended |  |  |  |
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Mar. 31, 2014 item | Mar. 31, 2013 | Mar. 31, 2014 Professional Technical Services | Mar. 31, 2013 Professional Technical Services | Mar. 31, 2014 Management Support Services | Sep. 30, 2013 Management Support Services | Mar. 31, 2013 Management Support Services | Sep. 30, 2012 Management Support Services
Business Acquisitions, Goodwill and Intangible Assets |  |  |  |  |  |  |  |
Number of business acquisitions | 0 |  |  |  |  |  |  |
Maximum period to determine final value of identifiable intangible assets | 12 months |  |  |  |  |  |  |
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 | $ 166,800,000
Post-Acquisition Adjustments | 5,000,000 |  | 5,000,000 |  |  |  |  |
Foreign Exchange Impact | (8,500,000) | (15,700,000) | (8,500,000) | (15,700,000) |  |  |  |
Acquired | 79,100,000 | 48,200,000 | 79,100,000 | 48,200,000 |  |  |  |
Goodwill at the end of the period | $ 1,887,447,000 | $ 1,807,900,000 | $ 1,720,600,000 | $ 1,641,100,000 | $ 166,800,000 | $ 166,800,000 | $ 166,800,000 | $ 166,800,000

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- Definition Maximum period from the date of acquisition to determine the final value of the identifiable intangible assets in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: 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 2: 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 + Details
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- Definition Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13816-109267 + Details
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- Definition Amount of increase (decrease) from adjustments after acquisition date under purchase accounting of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=21917927&loc=d3e961-128460 + Details
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- Definition Amount of increase (decrease) from foreign currency translation adjustments of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13816-109267 + Details
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- Definition The number of businesses acquired by the entity during the period. + References No definition available. + Details
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