Stockholders' Equity And Stock-Based Compensation (Summary Of Stock Options Issued To Officers, Directors, And Employees Under 2000 Stock Incentive Plan And 2005 Stock Plan) (Details) $ / shares in Units, shares in Thousands, $ in Thousands	9 Months Ended
	Jun. 30, 2017 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Document Period End Date	Jun. 30, 2017
Shares
Shares, Options outstanding at beginning of period | shares	8,690
Shares, Grants | shares	2,052
Shares, Exercises | shares	(1,025)
Shares, Forfeitures and cancellations | shares	(179)
Shares, Options vested and expected to vest | shares	8,895
Weighted-Average Exercise Price
Weighted Average Exercise Price, Options outstanding at beginning of period	$ 35.98
Weighted Average Exercise Price, Grants (in usd per share)	46.25
Weighted Average Exercise Price, Exercises (in usd per share)	34.66
Weighted Average Exercise Price, Forfeitures and cancellations (in usd per share)	37.26
Weighted Average Exercise Price, Options outstanding at end of period	38.31
Weighted Average Exercise Price, Options vested and expected to vest (in usd per share)	38.05
Weighted Average Exercise Price, Options exercisable (in usd per share)	$ 35.66
Weighted Average Remaining Contractual Life, Options vested and expected to vest at end of period	6 years 9 months 18 days
Weighted Average Remaining Contractual Life, Options exercisable	5 years 9 months 18 days
Aggregate Intrinsic Value, Options outstanding | $	$ 102,312
Aggregate Intrinsic Value, Options vested and expected to vest | $	97,680
Aggregate Intrinsic Value, Options exercisable | $	$ 68,079
Employee Stock Option [Member] | Options Granted From June Two Thousand Eight Member
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share Based Compensation Arrangement By Share Based Payment Award Options Becoming Exercisable	25.00%
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	36 months