Distribution Agreements, Net - Reconciliation of Activity for Other Identifiable Intangible Assets Net (Parenthetical) (Detail) - Distribution Agreements [Member] - USD ($) $ in Thousands		12 Months Ended
		Dec. 30, 2018	Dec. 31, 2017
Finite Lived Intangible Assets [Line Items]
Increase in acquisitions for distribution territories and regional manufacturing facilities acquired	[1]	$ 4,700	$ 16,000
2017 System Transformation Transactions Acquisitions [Member]
Finite Lived Intangible Assets [Line Items]
Increase in acquisitions for distribution territories and regional manufacturing facilities acquired			$ 51,500

[1] Measurement period adjustment relates to post-closing adjustments made in accordance with the terms and conditions of the applicable asset purchase agreement or asset exchange agreement for each System Transformation Transaction. The adjustments to amortization expense associated with this measurement period adjustment were not material to the consolidated financial statements.