Acquisitions and Divestitures - Schedule of Consolidated Statement of Operations (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 30, 2018	Sep. 30, 2018	Jul. 01, 2018	Apr. 01, 2018	Dec. 31, 2017	Oct. 01, 2017	Jul. 02, 2017	Apr. 02, 2017	Dec. 30, 2018	Dec. 31, 2017	Jan. 01, 2017
Business Acquisition [Line Items]
Net sales	$ 1,136,571	$ 1,204,033	$ 1,220,003	$ 1,064,757	$ 1,117,630	$ 1,152,561	$ 1,159,804	$ 857,593	$ 4,625,364	$ 4,287,588	$ 3,130,145
Income from operations	$ 12,816	$ 44,404	$ 19,679	$ (18,997)	$ 470	$ 37,472	$ 48,655	$ 14,950	57,902	101,547	$ 131,199
2017 System Transformation Transactions Acquisitions [Member]
Business Acquisition [Line Items]
Net sales									1,191,468	740,259
Income from operations									25,460	10,754
2017 System Transformation Transactions [Member]
Business Acquisition [Line Items]
Net sales									1,191,468	971,560
Income from operations									$ 25,460	33,727
October 2017 Divestitures [Member]
Business Acquisition [Line Items]
Net sales										231,301
Income from operations										$ 22,973