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Property, Plant, and Equipment, Net (Narrative) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended	24 Months Ended							3 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014 Second Campus Rockford Illinois [Member]	Sep. 30, 2013 Second Campus Rockford Illinois [Member]	Sep. 30, 2014 New Campus Fort Collins Colorado [Member]	Sep. 30, 2013 New Campus Fort Collins Colorado [Member]	Sep. 30, 2014 Building Site Niles Illinois [Member]	Sep. 30, 2013 Building Site Niles Illinois [Member]	Sep. 30, 2014 Assets Held-for-sale [Member]	Sep. 30, 2014 Assets Held-for-sale [Member] Land and Building [Member]
Construction in progress	$ 223,958	$ 81,428	$ 85,283	$ 15,691	$ 37,268	$ 10,514	$ 55,629	$ 12,067
Capitalized interest			2,963	444	2,392	394	1,688	0
Property, Plant and Equipment, Net	513,279	350,048								2,465
Asset Impairment Charges	$ 3,138	$ 0							$ 3,138

X

- 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 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 360

-SubTopic 10

-Section 45

-Paragraph 4

-URI http://asc.fasb.org/extlink&oid=8077374&loc=d3e2420-110228

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X

- Definition

Amount of structure or a modification to a structure under construction. Includes recently completed structures or modifications to structures that have not been placed into service.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 360

-SubTopic 10

-Section 50

-Paragraph 1

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229

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X

- Definition

Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 360

-SubTopic 10

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.13)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 13

-Subparagraph a

-Article 5



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 8

-Article 7

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X

- Definition

The amount of interest that was capitalized on capital projects that have not been completed and assets being constructed that are not ready to be placed into service.

+ References

No definition available.

+ Details

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