Composition Of Certain Financial Statement Captions (Schedule Of Accounts Receivable) (Details) - USD ($) $ in Thousands	Mar. 29, 2024	Sep. 29, 2023
Composition Of Certain Financial Statement Captions [Abstract]
Trade accounts receivable	$ 132,787	$ 137,820
Accounts receivable from patent administration program licensees	155,557	134,108
Contract assets	243,275	182,268
Accounts receivable and contract assets, gross	531,619	454,196
Less: allowance for credit losses on accounts receivable and contract assets	(6,318)	(9,821)
Total accounts receivable and contract assets, net	$ 525,301	$ 444,375