Consolidated Statement of Comprehensive Income - USD ($) $ in Millions	3 Months Ended
	Jan. 01, 2021	Dec. 27, 2019
Statement of Comprehensive Income [Abstract]
Net income	$ 509.3	$ 257.1
Other comprehensive income (loss), net of tax
Fair value of investments	(0.2)	(0.1)
Other Comprehensive (Income) Loss, Defined Benefit Plan, before Reclassification Adjustment, after Tax	(0.3)	0.0
Comprehensive income	$ 509.4	$ 257.0