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Components of Inventory (Detail) - USD ($) $ in Thousands | Sep. 30, 2016 | Sep. 30, 2015
--- | --- | ---
Inventory [Line Items] |  |
Product | $ 25,419 | $ 35,599
Parts and equipment | 20,475 | 20,072
Total inventory | $ 45,894 | $ 55,671

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