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Property, Plant, and Equipment, Net (Property, Plant, and Equipment - Net) (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2017
Property, Plant and Equipment [Line Items] |  |  |
Property, Plant and Equipment, Gross | $ 1,467,154 |  | $ 1,442,896
Less accumulated depreciation | (536,996) |  | (520,853)
Property, Plant and Equipment, Net, Total | 930,158 |  | 922,043
Depreciation expense | 14,827 | $ 12,455 |
Capitalized interest | 601 | $ 472 |
Land and Land Improvements [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, Plant and Equipment, Gross | 88,536 |  | 88,326
Building and Building Improvements [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, Plant and Equipment, Gross | 515,338 |  | 514,453
Leasehold Improvements [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, Plant and Equipment, Gross | 16,425 |  | 16,142
Machinery and Equipment, Excluding Computer and Office Equipment [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, Plant and Equipment, Gross | 560,264 |  | 543,641
Computer Equipment and Software [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, Plant and Equipment, Gross | 125,628 |  | 124,723
Office furniture and equipment [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, Plant and Equipment, Gross | 24,455 |  | 24,308
Other Capitalized Property Plant and Equipment [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, Plant and Equipment, Gross | 19,423 |  | 19,393
Construction in Progress [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, Plant and Equipment, Gross | $ 117,085 |  | $ 111,910

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- Definition Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services. + 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 (c) -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 210.5-02.14) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation. + 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=98514028&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 + Details
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- Definition Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business 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 -Subparagraph (b) -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 + Details
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