Consolidated Statement of Comprehensive Income - USD ($) $ in Millions	3 Months Ended
	Dec. 29, 2023	Dec. 30, 2022
Statement of Comprehensive Income [Abstract]
Net income	$ 231.3	$ 309.4
Other comprehensive income (loss), net of tax:
Fair value of investments	0.1	0.0
Other Comprehensive (Income) Loss, Defined Benefit Plan, before Reclassification Adjustment, after Tax	(0.2)	(0.8)
Comprehensive income	$ 231.2	$ 308.6