Consolidated Statement of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Apr. 02, 2021	Mar. 27, 2020	Apr. 02, 2021	Mar. 27, 2020
Statement of Comprehensive Income [Abstract]
Net income	$ 325.0	$ 181.1	$ 834.3	$ 438.1
Other comprehensive income, net of tax
Fair value of investments	(0.1)	0.5	(0.3)	0.4
Other Comprehensive (Income) Loss, Defined Benefit Plan, before Reclassification Adjustment, after Tax	0.0	0.0	(0.3)	0.0
Comprehensive income	$ 324.9	$ 181.6	$ 834.3	$ 438.5