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Income Taxes (Schedule Of Effective Tax Rate Differs From The U.S. Federal Statutory Rate) (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2017
Income Tax Disclosure [Abstract]                      
Income tax provision at statutory rate                 $ 113,633 $ 147,921 $ 201,431
State taxes, net of federal benefit                 14,206 9,349 9,235
Tax impact of foreign operations                 (9,161) (6,696) (40,606)
Research and development and other credits                 (12,760) (13,159) (12,795)
Domestic manufacturing deduction                 0 (9,722) (15,802)
Stock-based and other compensation                 6,771 (150) 12,688
EffectiveIncomeTaxRateReconciliationTaxCutsAndJobsActAmount                 0 21,015 0
Other                 688 1,513 605
Income taxes (benefit) $ 23,274 $ 21,557 $ 34,140 $ 34,406 $ 26,378 $ 31,469 $ 36,511 $ 55,713 $ 113,377 $ 150,071 $ 154,756