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Income Taxes (Components Of Income Before Income Taxes) (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2013
Income Tax Disclosure [Abstract]                      
United States                 $ 530,684 $ 492,577 $ 431,833
International                 30,660 4,765 6,259
Income before income taxes $ 149,464 $ 140,850 $ 136,121 $ 134,909 $ 149,804 $ 127,272 $ 110,887 $ 109,379 $ 561,344 $ 497,342 $ 438,092