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Components of Inventory (Detail) - USD ($) $ in Thousands | Sep. 30, 2017 | Sep. 30, 2016
--- | --- | ---
Inventory [Line Items] |  |
Product | $ 37,941 | $ 25,419
Parts and equipment | 21,655 | 20,475
Total inventory | $ 59,596 | $ 45,894

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