Business Segments and Geographic Information - Additional Information (Detail)	3 Months Ended								12 Months Ended
	Sep. 30, 2017 USD ($)	Jul. 01, 2017 USD ($)	Apr. 01, 2017 USD ($)	Dec. 31, 2016 USD ($)	Sep. 24, 2016 USD ($)	Jun. 25, 2016 USD ($)	Mar. 26, 2016 USD ($)	Dec. 26, 2015 USD ($)	Sep. 30, 2017 USD ($) Segment	Sep. 24, 2016 USD ($)	Sep. 26, 2015 USD ($)
Segment Reporting Disclosure [Line Items]
Number of reportable segments | Segment									5
Revenues	$ 802,900,000	$ 806,100,000	$ 715,400,000	$ 734,400,000	$ 726,800,000	$ 717,400,000	$ 693,300,000	$ 695,200,000	$ 3,058,800,000	$ 2,832,700,000	$ 2,705,000,000
Intersegment
Segment Reporting Disclosure [Line Items]
Revenues									$ 0	$ 0	$ 0