Segment Information - Geographic Information (Detail) $ in Millions	3 Months Ended								12 Months Ended
	Sep. 29, 2017 USD ($) country	Jun. 30, 2017 USD ($)	Mar. 31, 2017 USD ($)	Dec. 30, 2016 USD ($)	Sep. 30, 2016 USD ($) country	Jul. 01, 2016 USD ($)	Apr. 01, 2016 USD ($)	Jan. 01, 2016 USD ($)	Sep. 29, 2017 USD ($) country	Sep. 30, 2016 USD ($) country	Oct. 02, 2015 USD ($) country
Segment Reporting Information [Line Items]
Revenues	$ 739.0	$ 662.4	$ 655.0	$ 611.8	$ 747.2	$ 642.9	$ 615.2	$ 615.8	$ 2,668.2	$ 2,621.1	$ 2,490.7
Property, plant and equipment, net	255.3				258.6				255.3	258.6	273.1
United States
Segment Reporting Information [Line Items]
Revenues									1,237.0	1,161.7	1,212.3
Property, plant and equipment, net	163.8				177.0				163.8	177.0	194.8
International
Segment Reporting Information [Line Items]
Revenues									1,431.2	1,459.4	1,278.4
Property, plant and equipment, net	$ 91.5				$ 81.6				$ 91.5	$ 81.6	$ 78.3
Revenues | Geographic Concentration Risk
Segment Reporting Information [Line Items]
Number of countries outside the U.S. representing at least 10% | country	0				0				0	0	0
Property, plant and equipment, net | Geographic Concentration Risk
Segment Reporting Information [Line Items]
Number of countries outside the U.S. representing at least 10% | country	0				0				0	0	0