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Business Segments (Schedule Of Revenue From External Customers, By Geographical Areas) (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Sep. 30, 2012 | Sep. 30, 2011 | Sep. 30, 2010
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Total revenues | $ 717,194 | $ 562,397 | $ 550,692
Europe (including former Soviet Union) [Member] |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Total revenues | 24,857 | 7,107 | 25,174
Far East [Member] |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Total revenues | 14,865 | 17,172 | 24,998
Middle East and Africa [Member] |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Total revenues | 79,781 | 46,304 | 25,880
North, Central and South America (excluding U.S.) [Member] |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Total revenues | 184,935 | 112,949 | 81,506
UNITED STATES |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Total revenues | $ 412,756 | $ 378,865 | $ 393,134

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- Definition Aggregate revenue recognized during the period (derived from goods sold, services rendered, insurance premiums, or other activities that constitute an entity's earning process). For financial services companies, also includes investment and interest income, and sales and trading gains. + 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=6880815&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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