Income Taxes (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Apr. 01, 2022	Mar. 26, 2021	Apr. 01, 2022	Mar. 26, 2021	Sep. 24, 2021
Income Tax Disclosure [Abstract]
Unrecognized tax benefits, gross	$ 71,100		$ 71,100		$ 66,100
Unrecognized tax benefits if recognized, would affect our effective tax rate	$ 47,500		$ 47,500		$ 43,600
Effective tax rate (as a percent)	16.00%	10.60%	13.60%	13.20%
Provision (benefit) for income taxes	$ (6,932)	$ (9,022)	$ (18,364)	$ (33,294)
Federal tax rate	21.00%