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Components of Inventory (Detail) (USD $) In Thousands, unless otherwise specified | Jun. 30, 2013 | Sep. 30, 2012
--- | --- | ---
Inventory [Line Items] |  |
Product | $ 31,135 | $ 30,786
Parts and equipment | 17,949 | 16,679
Total inventory | $ 49,084 | $ 47,465

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