Quarterly report pursuant to Section 13 or 15(d)

Comprehensive Income (Details)

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Comprehensive Income (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Mar. 31, 2012
Mar. 31, 2011
Comprehensive Income        
Net income $ 14,273 $ 18,219 $ 31,977 $ 35,701
Foreign currency translation adjustments 3,358 2,459 7,589 6,388
Comprehensive income $ 17,631 $ 20,678 $ 39,566 $ 42,089