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Business Acquisitions, Goodwill and Intangible Assets (Details 2) (USD $) | 6 Months Ended |
--- | --- | ---
Mar. 31, 2014 | Mar. 31, 2013 | Sep. 30, 2013
Identifiable intangible assets with finite useful lives |  |  |
Gross Amount | $ 270,200,000 |  | $ 249,800,000
Accumulated Amortization | (178,100,000) |  | (166,700,000)
Intangible Assets, Net | 92,121,000 |  | 83,149,000
Amortization expense | 11,400,000 | 10,800,000 |
Estimated amortization expense of intangible assets for the remainder of fiscal 2013 and for the succeeding years |  |  |
2014 (six months remaining) | 11,600,000 |  |
2015 | 21,700,000 |  |
2016 | 15,400,000 |  |
2017 | 12,900,000 |  |
2018 | 9,700,000 |  |
Thereafter | 20,800,000 |  |
Intangible Assets, Net | 92,121,000 |  | 83,149,000
Backlog |  |  |
Identifiable intangible assets with finite useful lives |  |  |
Gross Amount | 104,400,000 |  | 94,900,000
Accumulated Amortization | (93,100,000) |  | (89,400,000)
Intangible Assets, Net | 11,300,000 |  | 5,500,000
Estimated amortization expense of intangible assets for the remainder of fiscal 2013 and for the succeeding years |  |  |
Intangible Assets, Net | 11,300,000 |  | 5,500,000
Backlog | Minimum |  |  |
Identifiable intangible assets with finite useful lives |  |  |
Amortization Period | 1 year |  |
Backlog | Maximum |  |  |
Identifiable intangible assets with finite useful lives |  |  |
Amortization Period | 5 years |  |
Customer relationships |  |  |
Identifiable intangible assets with finite useful lives |  |  |
Gross Amount | 158,000,000 |  | 147,100,000
Accumulated Amortization | (77,200,000) |  | (69,500,000)
Intangible Assets, Net | 80,800,000 |  | 77,600,000
Amortization Period | 10 years |  |
Estimated amortization expense of intangible assets for the remainder of fiscal 2013 and for the succeeding years |  |  |
Intangible Assets, Net | 80,800,000 |  | 77,600,000
Trademark / tradename |  |  |
Identifiable intangible assets with finite useful lives |  |  |
Gross Amount | 7,800,000 |  | 7,800,000
Accumulated Amortization | $ (7,800,000) |  | $ (7,800,000)
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 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: 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 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 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 expected to be recognized after the fifth fiscal year following the latest fiscal year for assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References No definition available. + Details
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- Definition Amount of amortization expense expected to be recognized during the fifth fiscal year following the latest fiscal year for 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)(3) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition Amount of amortization expense expected to be recognized during the third fiscal year following the latest fiscal year for 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)(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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- 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=26713463&loc=d3e16323-109275 + Details
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