Segment Information - Geographic Information (Detail) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Sep. 30, 2016	Jul. 01, 2016	Apr. 01, 2016	Jan. 01, 2016	Oct. 02, 2015	Jul. 03, 2015	Apr. 03, 2015	Jan. 02, 2015	Sep. 30, 2016	Oct. 02, 2015	Sep. 26, 2014
Segment Reporting Information [Line Items]
Revenues	$ 912.5	$ 789.4	$ 758.8	$ 757.1	$ 817.8	$ 784.0	$ 759.4	$ 737.9	$ 3,217.8	$ 3,099.1	$ 3,049.8
Property, plant and equipment, net	379.2				379.2				379.2	379.2	338.0
United States
Segment Reporting Information [Line Items]
Revenues									1,352.8	1,418.3	1,290.1
Property, plant and equipment, net	286.7				292.6				286.7	292.6	262.7
International
Segment Reporting Information [Line Items]
Revenues									1,865.0	1,680.8	1,759.7
Property, plant and equipment, net	$ 92.5				$ 86.6				$ 92.5	$ 86.6	$ 75.3