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Property, Plant, and Equipment, Net (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2013
Construction in progress | $ 223,958 | $ 252,763 | $ 223,958 |
Property, Plant and Equipment, Net | 513,279 | 756,100 | 513,279 |
Asset Impairment Charges | 3,138 | 0 | 3,138 | $ 0
Second Campus Rockford Illinois [Member] |  |  |  |
Construction in progress | 85,283 | 47,629 | 85,283 |
Capitalized interest | 2,963 | 499 | 2,963 |
New Campus Fort Collins Colorado [Member] |  |  |  |
Construction in progress | 37,268 | 151,669 | 37,268 |
Capitalized interest | 2,392 | 5,205 | 2,392 |
Building Site Niles Illinois [Member] |  |  |  |
Construction in progress | 55,629 | 0 | 55,629 |
Disposal Group, Held-for-sale, Not Discontinued Operations [Member] |  |  |  |
Property, Plant and Equipment, Net | $ 2,465 | 681 | $ 2,465 |
Building and Building Improvements [Member] | Second Campus Rockford Illinois [Member] |  |  |  |
Contruction in progress placed into service |  | 120,000 |  |
Buildings and improvements and Office furniture and equipment [Member] | Building Site Niles Illinois [Member] |  |  |  |
Contruction in progress placed into service |  | $ 77,000 |  |

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- Definition Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=51824106&loc=d3e2420-110228 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 + Details
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