Taxes on Earnings - Schedule of Taxes on Earnings (Detail) - USD ($) $ in Millions	12 Months Ended
	Sep. 29, 2017	Sep. 30, 2016	Oct. 02, 2015
Current provision:
Federal	$ 31.6	$ 57.6	$ 5.5
State and local	4.3	7.4	4.6
Foreign	68.9	74.5	73.2
Total current	104.8	139.5	83.3
Deferred provision (benefit):
Federal	(13.3)	(14.9)	4.4
State and local	0.2	(1.6)	(0.4)
Foreign	(4.0)	(7.7)	2.6
Total deferred	(17.1)	(24.2)	6.6
Taxes on earnings	$ 87.7	$ 115.3	$ 89.9