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Business Acquisitions, Goodwill and Intangible Assets (Details 4) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2014 | Sep. 30, 2013
Estimated amortization expense of intangible assets for the remainder of fiscal 2013 and for the succeeding years |  |
2015 | $ 26,500 |
2016 | 17,500 |
2017 | 13,200 |
2018 | 9,900 |
2019 | 9,000 |
Thereafter | 14,100 |
Intangible Assets, Net | 90,238 | $ 83,149
Gross Amount | 280,900 | 249,800
Accumulated Amortization | (190,700) | (166,700)
Intangible Assets, Net | 90,238 | 83,149
Amortization expense | 24,000 | 21,200
Contractual Rights [Member] |  |
Estimated amortization expense of intangible assets for the remainder of fiscal 2013 and for the succeeding years |  |
Intangible Assets, Net | 12,600 | 5,500
Gross Amount | 110,000 | 94,900
Accumulated Amortization | (97,400) | (89,400)
Intangible Assets, Net | $ 12,600 | 5,500
Contractual Rights [Member] | Minimum |  |
Estimated amortization expense of intangible assets for the remainder of fiscal 2013 and for the succeeding years |  |
Amortization Period | 1 year |
Contractual Rights [Member] | Maximum |  |
Estimated amortization expense of intangible assets for the remainder of fiscal 2013 and for the succeeding years |  |
Amortization Period | 5 years |
Backlog and customer relationship |  |
Estimated amortization expense of intangible assets for the remainder of fiscal 2013 and for the succeeding years |  |
Intangible Assets, Net | $ 76,200 | 77,600
Gross Amount | 161,600 | 147,100
Accumulated Amortization | (85,400) | (69,500)
Intangible Assets, Net | $ 76,200 | 77,600
Amortization Period | 10 years |
Trademark / tradename |  |
Estimated amortization expense of intangible assets for the remainder of fiscal 2013 and for the succeeding years |  |
Intangible Assets, Net | $ 1,400 |
Gross Amount | 9,300 | 7,800
Accumulated Amortization | (7,900) | $ (7,800)
Intangible Assets, Net | $ 1,400 |
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=31042434&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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