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Income Taxes (Details 1) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2010
Provision for income taxes attributable to continuing operations      
Income taxes at the federal statutory rate $ 77,789 $ 65,969 $ 52,941
Non-deductible expense related to incentive stock options (633) 0 1
State income tax, net of federal benefit 349 2,728 2,172
Change in valuation allowance 2,242 1,425 1,273
Federal tax credits (922) (167) (134)
Foreign tax credit (4,342) (4,356) (2,849)
Effect of permanently reinvesting foreign earnings (3,820) 0 0
Other 589 873 738
Total provision $ 71,252 $ 66,472 $ 54,142
Effective Tax Rate 32.10% 35.30% 35.80%