Other Financial Information - Other Assets (Detail) - USD ($) $ in Millions	Oct. 02, 2020	Sep. 27, 2019
Other Financial Information [Abstract]
Long-term receivables	$ 110.3	$ 74.3
Deferred Compensation Plan ("DCP") assets	82.3	79.0
Equity investments	88.4	64.2
Long-term available-for-sale securities	44.6	58.2
CPTC Term loan	0.0	44.0
RPTC senior secured debt	25.2	23.5
Other	65.5	54.0
Total other assets	$ 416.3	$ 397.2