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Summary of Significant Accounting Policies - Inventory and Cash and Cash Equivalents and Cash Concentrations (Details) - USD ($) $ in Thousands | Sep. 30, 2016 | Sep. 30, 2015
--- | --- | ---
Inventory [Line Items] |  |
Inventory, net | $ 140,224 | $ 124,084
Foreign | Reportable geographical components |  |
Inventory [Line Items] |  |
Inventory, net | 19,000 | 16,500
Prepaid expenses and other current assets |  |
Inventory [Line Items] |  |
Restricted cash | 3,000 | $ 100
Other assets, net |  |
Inventory [Line Items] |  |
Restricted cash | $ 4,100 |

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- Definition Amount after valuation and LIFO reserves of inventory expected to be sold, or consumed 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)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 330 -SubTopic 10 -Section 35 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=68049868&loc=d3e3927-108312 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e6676-107765 + Details
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