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Geographic Information - Schedule of Revenues from External Customers by Geographical Areas (Details) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2015
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Total revenues | $ 395,911 | $ 565,243 | $ 661,858
United States |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Total revenues | 279,352 | 405,298 | 474,038
Canada |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Total revenues | 45,540 | 77,252 | 101,191
Middle East and Africa |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Total revenues | 26,639 | 40,294 | 40,557
Europe |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Total revenues | 21,194 | 26,200 | 23,567
Mexico, Central and South America |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Total revenues | 19,309 | 8,304 | 10,479
Far East |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Total revenues | $ 3,877 | $ 7,895 | $ 12,026

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- Definition Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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