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Income Taxes (Details 1) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2012
Provision for income taxes attributable to continuing operations                            
Income taxes at the federal statutory rate                       $ 8,818 $ 28,170 $ 74,942
Non-deductible expense related to incentive stock options                       0 0 (633)
State income tax, net of federal benefit                       (910) 1,169 272
Change in valuation allowance                       481 681 1,099
Federal tax credits                       (124) (314) (923)
Foreign tax credit                       (2,174) (3,263) (4,342)
Effect of permanently reinvesting foreign earnings                       (445) 85 (2,842)
Other                       (390) (330) 92
Total income tax expense $ (825) $ 406 $ 852 $ 4,823 $ (11,196) $ 7,362 $ 15,765 $ 14,267 $ 16,190 $ 13,677 $ 17,713 $ 5,256 $ 26,198 $ 67,665
Effective tax rate                       21.00% 33.00% 32.00%