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Business Acquisitions, Goodwill and Intangible Assets - Intangible Assets (Details) - USD ($) $ in Thousands | 6 Months Ended |
--- | --- | ---
Mar. 31, 2018 | Sep. 30, 2017
Identifiable intangible assets with finite useful lives |  |
Gross Amount | $ 1,305,800 | $ 1,301,900
Accumulated Amortization | (937,600) | (886,800)
Intangible Assets, Net | 368,215 | 415,096
Backlog and customer relationships |  |
Identifiable intangible assets with finite useful lives |  |
Gross Amount | 1,287,500 | 1,283,600
Accumulated Amortization | (920,800) | (870,200)
Intangible Assets, Net | $ 366,700 | 413,400
Backlog and customer relationships | Minimum |  |
Identifiable intangible assets with finite useful lives |  |
Amortization Period | 1 year |
Backlog and customer relationships | Maximum |  |
Identifiable intangible assets with finite useful lives |  |
Amortization Period | 11 years |
Trademark / tradename |  |
Identifiable intangible assets with finite useful lives |  |
Gross Amount | $ 18,300 | 18,300
Accumulated Amortization | (16,800) | (16,600)
Intangible Assets, Net | $ 1,500 | $ 1,700
Trademark / tradename | Minimum |  |
Identifiable intangible assets with finite useful lives |  |
Amortization Period | 3 months 18 days |
Trademark / tradename | Maximum |  |
Identifiable intangible assets with finite useful lives |  |
Amortization Period | 2 years |

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- Definition Useful life of finite-lived 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 Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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- Definition Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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