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Property, Plant, and Equipment, Net (Property, Plant, and Equipment - Net) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Mar. 31, 2018 | Mar. 31, 2017 | Sep. 30, 2017
Property, Plant and Equipment [Line Items] |  |  |  |  |
Property, Plant and Equipment, Gross | $ 1,481,552 |  | $ 1,481,552 |  | $ 1,442,896
Less accumulated depreciation | (538,119) |  | (538,119) |  | (520,853)
Property, Plant and Equipment, Net, Total | 943,433 |  | 943,433 |  | 922,043
Depreciation expense | 15,754 | $ 13,663 | 30,581 | $ 26,118 |
Capitalized interest | 633 | $ 481 | 1,234 | $ 953 |
Land and Land Improvements [Member] |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Property, Plant and Equipment, Gross | 88,595 |  | 88,595 |  | 88,326
Building and Building Improvements [Member] |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Property, Plant and Equipment, Gross | 516,687 |  | 516,687 |  | 514,453
Leasehold Improvements [Member] |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Property, Plant and Equipment, Gross | 18,303 |  | 18,303 |  | 16,142
Machinery and Equipment, Excluding Computer and Office Equipment [Member] |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Property, Plant and Equipment, Gross | 575,695 |  | 575,695 |  | 543,641
Computer Equipment and Software [Member] |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Property, Plant and Equipment, Gross | 122,663 |  | 122,663 |  | 124,723
Office furniture and equipment [Member] |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Property, Plant and Equipment, Gross | 24,661 |  | 24,661 |  | 24,308
Other Capitalized Property Plant and Equipment [Member] |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Property, Plant and Equipment, Gross | 19,397 |  | 19,397 |  | 19,393
Construction in Progress [Member] |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Property, Plant and Equipment, Gross | $ 115,551 |  | $ 115,551 |  | $ 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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