Taxes on Earnings - Schedule of Taxes on Earnings (Detail) - USD ($) $ in Millions	12 Months Ended
	Sep. 27, 2019	Sep. 28, 2018	Sep. 29, 2017
Current provision:
Federal	$ 39.0	$ 188.3	$ 30.9
State and local	5.2	8.0	4.3
Foreign	69.3	47.9	67.5
Total current	113.5	244.2	102.7
Deferred provision (benefit):
Federal	4.0	43.7	(18.3)
State and local	2.8	(3.3)	(0.2)
Foreign	8.3	17.2	(7.1)
Total deferred	15.1	57.6	(25.6)
Taxes on earnings	$ 128.6	$ 301.8	$ 77.1