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Business Acquisitions, Goodwill and Intangible Assets - Intangible Assets (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2016
Identifiable intangible assets with finite useful lives |  |  |
Gross Amount | $ 1,259,300 |  | $ 1,263,500
Accumulated Amortization | (809,500) |  | (784,100)
Intangible Assets, Net | 449,785 |  | 479,439
Amortization expense | 25,400 | $ 65,100 |
Estimated amortization expense of intangible assets for the remainder of fiscal 2017 and for the succeeding years |  |  |
2017 (nine months remaining) | 72,100 |  |
2018 | 81,500 |  |
2019 | 76,300 |  |
2020 | 64,400 |  |
2021 | 54,600 |  |
Thereafter | 100,900 |  |
Intangible Assets, Net | 449,785 |  | 479,439
Backlog and customer relationships |  |  |
Identifiable intangible assets with finite useful lives |  |  |
Gross Amount | 1,242,900 |  | 1,247,100
Accumulated Amortization | (793,100) |  | (767,700)
Intangible Assets, Net | 449,800 |  | 479,400
Estimated amortization expense of intangible assets for the remainder of fiscal 2017 and for the succeeding years |  |  |
Intangible Assets, Net | $ 449,800 |  | 479,400
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 Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the third 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 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=26713463&loc=d3e16323-109275 + Details
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