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Business Acquisitions, Goodwill and Intangible Assets - Intangible Assets (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2014
Identifiable intangible assets with finite useful lives |  |  |
Gross Amount | $ 1,263,500 | $ 1,241,100 |
Accumulated Amortization | (784,100) | (581,700) |
Intangible Assets, Net | 479,439 | 659,438 |
Amortization expense | 202,400 | 391,000 | $ 24,000
Estimated amortization expense of intangible assets for the remainder of fiscal 2016 and for the succeeding years |  |  |
2017 | 96,300 |  |
2018 | 82,100 |  |
2019 | 76,700 |  |
2020 | 64,800 |  |
2021 | 55,100 |  |
Thereafter | 104,400 |  |
Intangible Assets, Net | 479,439 | 659,438 |
Backlog and customer relationships |  |  |
Identifiable intangible assets with finite useful lives |  |  |
Gross Amount | 1,247,100 | 1,224,700 |
Accumulated Amortization | (767,700) | (565,300) |
Intangible Assets, Net | 479,400 | 659,400 |
Estimated amortization expense of intangible assets for the remainder of fiscal 2016 and for the succeeding years |  |  |
Intangible Assets, Net | $ 479,400 | 659,400 |
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 | $ 16,400 | 16,400 |
Accumulated Amortization | $ (16,400) | $ (16,400) |
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 The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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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=26713463&loc=d3e16323-109275 + Details
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- Definition Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + 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)(3) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + 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)(3) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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