Consolidated Statement of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2023	Apr. 01, 2022	Mar. 31, 2023	Apr. 01, 2022
Statement of Comprehensive Income [Abstract]
Net income	$ 232.8	$ 305.8	$ 542.2	$ 705.7
Other comprehensive income (loss), net of tax:
Fair value of investments	0.0	(0.3)	0.0	(0.4)
Other Comprehensive (Income) Loss, Defined Benefit Plan, before Reclassification Adjustment, after Tax	0.0	0.0	(0.8)	3.3
Comprehensive income	$ 232.8	$ 305.5	$ 541.4	$ 708.6