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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, 2016 | Sep. 30, 2015 | Sep. 30, 2014
Revenues From External Customers And Long Lived Assets [Line Items] |  |  |
Total revenues | $ 565,243 | $ 661,858 | $ 647,814
United States |  |  |
Revenues From External Customers And Long Lived Assets [Line Items] |  |  |
Total revenues | 405,298 | 474,038 | 365,085
Canada |  |  |
Revenues From External Customers And Long Lived Assets [Line Items] |  |  |
Total revenues | 77,252 | 101,191 | 137,684
Middle East and Africa |  |  |
Revenues From External Customers And Long Lived Assets [Line Items] |  |  |
Total revenues | 40,294 | 40,557 | 84,330
Europe |  |  |
Revenues From External Customers And Long Lived Assets [Line Items] |  |  |
Total revenues | 26,200 | 23,567 | 34,920
Far East |  |  |
Revenues From External Customers And Long Lived Assets [Line Items] |  |  |
Total revenues | 7,895 | 12,026 | 15,127
Mexico, Central and South America |  |  |
Revenues From External Customers And Long Lived Assets [Line Items] |  |  |
Total revenues | $ 8,304 | $ 10,479 | $ 10,668

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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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