Stockholders' Equity And Stock-Based Compensation (Schedule Of Stock-Based Compensation Expense By Plan) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 29, 2024	Mar. 31, 2023	Mar. 29, 2024	Mar. 31, 2023
Stockholders' Equity And Stock-Based Compensation [Line Items]
Total stock-based compensation	$ 28,915	$ 29,827	$ 60,809	$ 61,067
Estimated benefit from income taxes	(4,143)	(4,497)	(9,142)	(9,199)
Total stock-based compensation, net of tax	24,772	25,330	51,667	51,868
Stock options
Stockholders' Equity And Stock-Based Compensation [Line Items]
Total stock-based compensation	1,505	2,008	3,630	4,413
Restricted stock units
Stockholders' Equity And Stock-Based Compensation [Line Items]
Total stock-based compensation	26,331	26,544	55,347	54,096
Share-Based Payment Arrangement, Amount Capitalized	100	300	200	700
Employee stock purchase plan
Stockholders' Equity And Stock-Based Compensation [Line Items]
Total stock-based compensation	$ 1,079	$ 1,275	$ 1,832	$ 2,558