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Inventories (Details) - USD ($) $ in Thousands | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Sep. 30, 2015
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Inventory Disclosure [Abstract] |  |  |  |  |  |
Finished goods | $ 33,690 |  |  |  | $ 40,260 | $ 55,074
Work in process | 2,512 |  |  |  | 8,272 | 5,632
Raw material | 70,099 |  |  |  | 65,682 | 70,769
Obsolescence reserve | (29,614) |  |  |  | (9,674) | (6,675)
Total | 76,687 |  |  |  | 104,540 | 124,800
Less current portion | 20,752 | $ 22,382 | $ 22,655 | $ 24,676 | 30,844 | 32,422
Non-current portion | $ 55,935 | $ 65,642 | $ 69,448 | $ 77,089 | $ 73,696 | $ 92,378

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- Definition Amount before valuation and LIFO reserves of completed merchandise or goods expected to be sold within one year or operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.6(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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