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	3 Months Ended
	Dec. 31, 2021 USD ($) $ / shares shares
Shares
Shares, Options outstanding at beginning of period | shares	4,577
Shares, Grants | shares	300
Shares, Exercises | shares	(291)
Shares, Forfeitures and cancellations | shares	(72)
Shares, Options vested and expected to vest | shares	4,319
Weighted-Average Exercise Price
Weighted Average Exercise Price, Options outstanding at beginning of period (in usd per share)	$ 59.18
Weighted Average Exercise Price, Grants (in usd per share)	91.46
Weighted Average Exercise Price, Exercises (in usd per share)	45.14
Weighted Average Exercise Price, Forfeitures and cancellations (in usd per share)	75.12
Weighted Average Exercise Price, Options outstanding at end of period (in usd per share)	61.95
Weighted Average Exercise Price, Options vested and expected to vest (in usd per share)	61.28
Weighted Average Exercise Price, Options exercisable (in usd per share)	$ 55.63
Weighted Average Remaining Contractual Life, Options vested and expected to vest at end of period	5 years 8 months 23 days
Weighted Average Remaining Contractual Life, Options exercisable	4 years 9 months 3 days
Aggregate Intrinsic Value, Options outstanding | $	$ 147,956
Aggregate Intrinsic Value, Options vested and expected to vest | $	146,852
Aggregate Intrinsic Value, Options exercisable | $	$ 125,879