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Business Acquisitions, Goodwill and Intangible Assets - Intangible Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Identifiable intangible assets with finite useful lives
Gross Amount	$ 1,302,500	$ 1,303,400
Accumulated Amortization	(1,069,500)	(983,500)
Intangible Assets, Net	233,018	319,892
Backlog and customer relationships
Identifiable intangible assets with finite useful lives
Gross Amount	1,284,200	1,285,100
Accumulated Amortization	(1,051,200)	(966,000)
Intangible Assets, Net	$ 233,000	319,100
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	$ (18,300)	(17,500)
Intangible Assets, Net		$ 800
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

X

- 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

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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/disclosureRef
-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

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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/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 928
-SubTopic 340
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6473545&loc=d3e61844-108004

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-Section 50
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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

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Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 2
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