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Geographic Information (Schedule of Revenues from External Customers by Geographical Areas) (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2012
Revenues From External Customers And Long Lived Assets [Line Items] |  |  |
Total revenues | $ 647,814 | $ 640,867 | $ 690,741
United States |  |  |
Revenues From External Customers And Long Lived Assets [Line Items] |  |  |
Total revenues | 365,085 | 374,453 | 388,977
Canada |  |  |
Revenues From External Customers And Long Lived Assets [Line Items] |  |  |
Total revenues | 137,684 | 113,391 | 92,656
Middle East and Africa |  |  |
Revenues From External Customers And Long Lived Assets [Line Items] |  |  |
Total revenues | 84,330 | 61,618 | 79,778
Europe (including former Soviet Union) |  |  |
Revenues From External Customers And Long Lived Assets [Line Items] |  |  |
Total revenues | 34,920 | 24,092 | 24,857
Far East |  |  |
Revenues From External Customers And Long Lived Assets [Line Items] |  |  |
Total revenues | 15,127 | 35,388 | 12,418
Mexico, Central and South America |  |  |
Revenues From External Customers And Long Lived Assets [Line Items] |  |  |
Total revenues | $ 10,668 | $ 31,925 | $ 92,055

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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=26872669&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 + Details
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