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Components of Inventory (Detail) - USD ($) $ in Thousands | Dec. 31, 2017 | Sep. 30, 2017
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Inventory Disclosure [Abstract] |  |
Product | $ 49,842 | $ 37,941
Parts and equipment | 21,662 | 21,655
Total inventory | $ 71,504 | $ 59,596

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- Definition Gross amount of components of assembled products that can be sold directly or indirectly through sales of assembled products. + 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) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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