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Comprehensive Income (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Sep. 30, 2011 | Sep. 30, 2010 | Sep. 30, 2009
Tax benefit (provision) of comprehensive income |  |  |
Foreign currency translation tax benefit / (provision) | $ (5,369) | $ 1,918 | $ 1,598
Available for sale securities tax benefit / (provision) | (325) |  |
Total tax benefit / (provision) | $ (5,694) | $ 1,918 | $ 1,598

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