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Business Acquisitions, Goodwill and Intangible Assets - Intangible Assets (Details) - USD ($) $ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2019 | Sep. 30, 2018
Identifiable intangible assets with finite useful lives |  |
Gross Amount | $ 1,304,000 | $ 1,303,400
Accumulated Amortization | (1,026,800) | (983,500)
Intangible Assets, Net | 277,208 | 319,892
Backlog and customer relationships |  |
Identifiable intangible assets with finite useful lives |  |
Gross Amount | 1,285,700 | 1,285,100
Accumulated Amortization | (1,009,100) | (966,000)
Intangible Assets, Net | $ 276,600 | $ 319,100
Backlog and customer relationships | Minimum |  |
Identifiable intangible assets with finite useful lives |  |
Amortization Period | 1 year | 1 year
Backlog and customer relationships | Maximum |  |
Identifiable intangible assets with finite useful lives |  |
Amortization Period | 11 years | 11 years
Trademark / tradename |  |
Identifiable intangible assets with finite useful lives |  |
Gross Amount | $ 18,300 | $ 18,300
Accumulated Amortization | (17,700) | (17,500)
Intangible Assets, Net | $ 600 | $ 800
Trademark / tradename | Minimum |  |
Identifiable intangible assets with finite useful lives |  |
Amortization Period | 3 months 18 days | 3 months 18 days
Trademark / tradename | Maximum |  |
Identifiable intangible assets with finite useful lives |  |
Amortization Period | 2 years | 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 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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